A portable RV waste tank is a wheeled, towable polyethylene tote that lets you drain your rig’s black water and gray water tanks and haul the waste to a dump station without moving the whole trailer. Also called a tote tank or a honey wagon, it is the single piece of gear that turns boondocking from a compromise into a normal way to camp.
If you camp at state parks, national parks, or anywhere without a sewer hookup, a tote decides where you can sleep. Without one, every time your tanks fill you break camp and drive the entire rig to a dump station, which rules out most dispersed camping. With one, you pull 300 feet of hose, fill a tank, and roll it to the station while the campfire keeps burning.
Below is our list of the best portable waste tanks for RVs in 2026, based on the specs, capacities, wheel setups and owner feedback attached to each of these tanks. We also cover the part nobody else talks about: a 36-gallon tote weighs roughly 300 lb full, and that number decides whether you roll it or tow it.
One quick note on scope. Fresh water totes and portable camping toilets are different products and are not covered here. Every tank below is a waste transport tank.
Table of Contents
Top 3 Portable Waste Tanks for RVs in 2026
Camco Rhino 28-Gallon Tote…
- 28 gallon capacity
- No-flat wheels
- Steel tow adapter
- Tank rinser and ladder hook
Barker 4-Wheeler 42-Gallon…
- 42 gallon capacity
- Front double wheel swivel
- 3-inch side-discharge valve
- Combo vent and rinse port
Thetford SmartTote 18-Gallo…
- 18 gallon capacity
- Self-storing sewer hose
- AutoStop fill shutoff
- 4-wheel base
Best Portable Waste Tanks for RVs in 2026
| Product | Specs | Action |
|---|---|---|
| Camco Rhino 28-Gallon Tote Tank (39004) |
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| Barker 4-Wheeler Tote Tank (30844) |
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| Thetford Smart Portable Waste Tote (40510) |
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 Venustank 30-Gallon 2-Wheel Tote (TK30-2W) |
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 VINGLI 10-Gallon Wheeled Tank (25L) |
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 Thetford SmartTote2 12-Gallon 2-Wheel (40505) |
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 RecPro 36-Gallon Portable Waste Tank |
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1. Camco Rhino 28-Gallon Tote Tank (39004) – The One Most Owners Buy
Camco Rhino 28-Gallon Camper/RV Tote Tank – Features Large Heavy-Duty No-Flat Wheels & Built-in Gate Valve – Removable Steel Tow Adapter, 3’ Sewer Hose & More RV Accessories (39004)
28 gallon capacity
Blow-molded UV-stabilized HDPE
43 lb empty
44.75 x 24.88 x 44.75 in
Pros
- 27k+ ratings with a 4.7 average
- No-flat wheels and oversized handle
- Removable steel tow adapter
- Includes tank rinser and ladder hook
- Two-year Camco warranty
Cons
- Wide 24-inch footprint needs dedicated storage
- 43 lb empty is awkward to hand-carry
- Single gate valve with no fill shutoff
The Camco Rhino 28-gallon is the default recommendation in this category, and the numbers back that up. It carries a 4.7 average across more than 27,000 ratings, which is the largest owner base of any tank we looked at. The body is blow-molded UV-stabilized HDPE, made in the USA under a patented design, and it weighs 43 lb empty.
What stands out in the feedback is the wheel and handle package. The no-flat wheels roll over gravel and dirt without the pinch flats that plague air-filled tires, and the oversized handle gives you something to actually grip when you’re leaning into it. Owners repeatedly name those two things as the reason the tank is easy to get to a dump station.
At 28 gallons, it handles the black tank of most trailers and small Class Cs in a single transfer, and it matches well with rigs whose onboard tanks run 25 to 30 gallons. Jayco Owners members report Barker as the more commonly endorsed brand, but the Rhino is the one most owners here have actually kept for years at that review volume.
The honest drawback is bulk. At roughly 24 inches wide and 43 lb empty, this is not a tank you hand-carry, and the footprint is wide enough that it needs a dedicated storage spot on the trailer. Owners also point out there is only a single gate valve, with no AutoStop-style fill shutoff.
What the 28-gallon size actually buys you
Full, this tank is about 233 lb. That is right at the edge of what one person can tip onto a truck bed but comfortably below what a 42-gallon tote demands, which is why so many owners call this size the sweet spot between capacity and weight. It is also the size that most often fills in one transfer from a standard trailer black tank.
Where it falls short for larger rigs
If your onboard black tank runs 32.5 gallons, you will need two transfers, and iRV2 owners running that combination say exactly that. On a fifth wheel or a truck camper with a large black tank, the Camco Rhino 36-gallon or the Barker 42-gallon is the one-transfer answer. The tow adapter is what saves you here: hook it to a truck and roll it to the station instead of lifting.
2. Barker 4-Wheeler 42-Gallon Tote Tank (30844) – Highest Capacity
Barker 4-Wheeler Tote Tank – 42 Gallon Capacity (30844)
42 gallon capacity
Blow-molded polyethylene body
47 lb empty
45 x 24 x 14 in
Pros
- Largest capacity in the roundup
- Front double wheel swivel pulls easily when full
- 3-inch side-discharge valve means no lifting to empty
- Combo vent and rinse connection
- Removable metal handle stores flat
Cons
- Pneumatic tires crack and need replacing
- Retaining caps make wheel swaps awkward
- Full indicator must be loosened when filling
- 45 in height exceeds some dump ports
The Barker 4-Wheeler at 42 gallons is the tank you buy when you want one trip and do not want to think about whether one trip is enough. It carries a 4.5 average across more than 3,000 ratings, the second-largest base here, and owners tend to describe it in terms of years rather than seasons.
The front-mounted double wheel swivel on a heavy-duty extra large mounting plate is the piece reviewers praise most. It is engineered for quiet, smooth rolling, which matters when you are pulling a loaded tank up a gravel ramp at a dump station. The 3-inch conventional waste valve discharges to the side, so emptying never means tipping the tank up on one end.
Barker’s warranty support comes up repeatedly in owner threads as a reason people stay with the brand. One Good Sam traveler reported Barker replacing a leaking tank that was already out of warranty, and r/GoRVing owners specifically call out that support alongside the bearings and bigger wheels.
The tires are the weak point, and it is worth being blunt about it. Owners report the pneumatic tires cracking within a season or two, and the retaining caps on the axle are genuinely hard to get off, which turns a five-minute tire swap into a project. Check the 45-inch height against your trailer’s dump port clearance before buying.
Why the side-discharge valve changes the dumping job
Most competing totes empty by lifting or tipping. This one has a conventional 3-inch waste valve on the side, so you open the gate and walk away while the contents drain straight into the receiving port. That matters most at sites with a raised concrete curb, where owners otherwise have to lift one end of a loaded tank to get over the lip.
Where owners push back
The tire situation is the recurring complaint, and the full indicator is a second one: owners find it restricts airflow while filling and have to loosen it. Jayco Owners also flag that the tow handle can pop off a hitch ball over bumps, so a strap or bungee is not optional. At 47 lb empty and roughly 350 lb full, this is a tank that gets towed, not lifted.
3. Thetford SmartTote 18-Gallon 4-Wheel (40510) – Hose and Fill Control Built In
Thetford (40510) Smart Portable Waste Tote Tank with 4 Wheels – 18 Gallon Capacity
18 gallon capacity
4-wheel base
Patented self-storing sewer hose
AutoStop fill shutoff
Pros
- Hose stores attached so nothing else to buy
- AutoStop valve prevents overfilling and spills
- 4-wheel base is stable on uneven ground
- Compact storage design
- Self-contained system
Cons
- 18 gallons means more trips than 28-42 gallon models
- Only 195 ratings for long-term feedback
- Heavier and bulkier than small 2-wheel totes
This Thetford is the answer to the most common complaint in tote forums, which is that the hose never fits and the tank overfills. It is completely self-contained: the patented self-storing sewer hose stays connected at the bottom of the tank, so there is nothing else in the box to buy and nothing to lose between trips.
The AutoStop fill shutoff valve is the other headline feature. It stops the flow when the tank is full, which directly addresses the spill-and-handling risk that owners describe when they overfill a tank with no indicator. It rates 4.4 across 195 ratings, with 66% of those at five stars.
Four wheels give it better stability and maneuvering than the 2-wheel models, which matters when you are setting up next to a sewer port on soft ground. The design also stores compactly between uses, so it does not demand the same dedicated space the Rhino does.
The trade is capacity. At 18 gallons it sits between the entry-level totes and the large ones, so a rig with a 28-gallon or 32.5-gallon black tank needs more than one transfer. The review base is also thinner than the Camco and Barker tanks, so long-term owner history is correspondingly lighter.
What AutoStop actually prevents
Overfilling is the quiet hazard in this whole category. A tank filled past its working limit is heavier than you planned for, harder to lift over a curb, and more likely to spill in transit. Because the shutoff stops flow mechanically, you are not relying on a dipstick estimate in the dark at a dump station at night.
Where the 18-gallon limit bites
Owners pairing smaller totes with larger onboard tanks describe the predictable result: it works, and then you are making two trips anyway. iRV2 members running a 27-gallon tote against 32.5-gallon onboard tanks report exactly this pattern. If your black tank is above 20 gallons, treat 18 as a gray-water or weekend-only tank rather than a black-water solution.
4. Venustank 30-Gallon 2-Wheel Tote (TK30-2W) – Everything in the Box
Venustank 30 Gallon RV Portable Waste Tank 2 Wheel Tote Tank
30 gallon capacity
Blow-molded HDPE body
57.5 lb empty
43.5 x 25.5 x 17 in
Pros
- Complete kit with hose
- adapters
- caps and tow bar
- Integrated tank rinser and ladder hook
- 22-inch tow bar for towing
- Dual gate valves
- One-year manufacturer warranty
Cons
- Heaviest empty tank at 57.5 lb
- Some assembly required
- 43.5 in length needs real storage space
- Only 57 ratings so far
The Venustank 30-gallon is the most completely equipped tank in this group, and if you hate the idea of a second box of fittings, that is the pitch. The kit includes the tank, a 3-foot sewer hose with swivel bayonet and lug fittings, two 31-inch water hose rinse adapters, a clear elbow with a 4-in-1 adapter, a clear double bayonet elbow, three storage caps, two lanyard rinse caps, and a 22-inch tow bar.
That included accessory list solves a real problem. Owners across the forums complain repeatedly that the hose supplied with a tote is too short for the distance between the RV sewer outlet and where the tank will sit, and that rinse hardware is usually a separate purchase. Here it is all in the box.
Transport is handled by large solid rubber back wheels plus the 22-inch tow bar, so you can roll it like a suitcase over short distances or tow it behind a truck or golf cart. The integrated tank rinser, dual gate valves and ladder hook cover cleaning and storage in one design, and the blow-molded HDPE body is described as leak-free and sun-resistant.
It rates 4.7, but from a small base of 57 ratings, so treat that as promising rather than proven. The 57.5 lb empty weight is the heaviest of the tanks here, and at 43.5 inches long it needs genuine storage space. Some assembly is required, which is unusual for this category.
Why the included rinse adapters matter more than they look
Flushing a tote properly is hard without a water source and the right fittings. The two 31-inch water hose rinse adapters and the 4-in-1 clear elbow are exactly the hardware that turns a messy cleanup into a ten-minute job, and it is the part most competitors leave out of the box. Combined with the integrated tank rinser and the ladder hook for hanging it on the RV ladder, the storage story is unusually complete.
Where the weight gets in the way
At 57.5 lb empty, this is the tank you will want on the tow bar rather than in your hands. If your campsite to dump station distance is short and flat, rolling it works fine. If there is a steep grade, owners are consistent across forums: hand-pulling is not realistic and you need the truck or a helper. A truck-bed tote also eats space, and Jayco Owners specifically note a 42-gallon Barker taking a good bit of real estate.
5. VINGLI 10-Gallon Wheeled Tank (25L) – Light Hauling and Gray Water
VINGLI 10 Gallon Tote Tank| Portable Wheeled Fresh Water Tank for Camping/Picnic/Camper/RV, Food Grade Safety & Lightweight & Durable
10.6 gallon capacity
HDPE body
9.3 lb empty
14.76 x 9.06 x 31.5 in
Pros
- Lightest empty at 9.3 lb
- Works for gray water or as a fresh water holding tank
- Built-in accessory storage compartments
- Large-diameter outlet drains quickly
- One-year manufacturer warranty
Cons
- No standard 3/4-inch hose barb so adapters are needed
- Some caps lack gaskets and threads can strip
- Hard to roll once full
- Extended handle not included
The VINGLI 10-gallon tank is not built for black water, and pretending otherwise would be a mistake. It is the right answer for gray water, for van campers and pop-ups with small tanks, and for anyone whose real problem is a full tank they cannot physically move.
It weighs 9.3 lb empty and measures 14.76 by 9.06 by 31.5 inches, so it disappears into a pickup bed behind a fifth-wheel hitch. Food-grade number 2 HDPE makes it dual-purpose: owners use it to move gray water and also as a general fresh water holding tank for cleaning, though the manufacturer does not recommend direct drinking.
The build holds up better than the category usually suggests for a tank at this level, and it rates 4.3 across 259 ratings. The large-diameter outlet and anti-sticky HDPE interior surface make filling and rinsing fast, and built-in storage compartments hold the hose and faucet accessories so the parts do not disappear.
The hardware is where it gets thin. There is no standard 3/4-inch hose connection, so some transfer setups need an adapter, and some caps ship without gaskets with plastic threads that can strip if over-tightened. There are mounting holes for an extended handle that is not included. Full, this is over 160 lb, and the wheels are not up to that load on rough ground.
Why weight is the deciding factor here
A 10.6-gallon tank full weighs about 88 lb. That is a number most travelers over 50 can tip, roll over a curb, and lift into a truck bed without planning for it, which is exactly the constraint that eliminates bigger totes for some rigs. For anyone with back or mobility limits, that difference decides the purchase on its own.
Where it does not work
It will not carry a black water transfer from a normal trailer, and the small wheels struggle once it is loaded. Owners also report an occasional leak at the outlet tube. If you need black water capacity, look at the 28-gallon Camco Rhino or the 12-gallon Thetford instead, and treat this one as a gray water and utility tank.
6. Thetford SmartTote2 12-Gallon 2-Wheel (40505) – Low Profile for Small Trailers
SmartTote2 Portable RV Waste Tote Tank – 2 Wheels – 12 Gallon – Thetford 40505
12 gallon capacity
Polypropylene body
10.5 lb empty
Inlet height near 10 inches
Pros
- Lightest full weight at roughly 100 lb
- Low inlet suits low dump valves
- Arrives fully assembled with caps
- Compact enough to store under a camper
- Seals well with standard sewer hose fittings
Cons
- Hose not included
- No overfill indicator or vent valve
- Wheels can detach in transit
- Frequent dump trips
The Thetford SmartTote2 12-gallon solves a specific geometry problem. Its inlet sits at roughly 10 inches off the ground, which means it will connect to trailers with low dump ports where a taller tote simply cannot line up. It is also the lightest of the waste totes here at 10.5 lb empty.
It arrives fully assembled with caps for the hose opening and vent, which removes the most common complaint about entry-level totes, that they arrive as parts. It measures 18.5 by 10.5 by 30.6 inches, so it stores compactly under a camper or in a truck bed with a fifth-wheel hitch.
At 4.2 across 405 ratings, it is the lowest-rated tank in the roundup, and the reason is feature set rather than quality. There is no overfill indicator and no pop-up vent valve, so cautious owners dipstick it and end up making twice as many dump trips. Reviewers also note the wheels can detach in transit because of the mounting design.
The bigger issue is that no hose is included. You need a sewer hose with two female ends to make it work at all, which several buyers describe as misleading even though the listing states it. Budget for that before you order.
When a 12-gallon tank is genuinely enough
Twelve gallons handles the gray tank of a small pop-up or a travel trailer with a compact black tank, and a Jayco Owners member running a 20-gallon Thetford reported four years of trouble-free service. If your onboard tanks are small or you camp a few nights between dump runs, this is enough and it is far easier to move.
Where the size becomes the problem
Owners of larger rigs report that 21 gallons is already too small, which means 12 will be worse for them. Full, this tank is around 100 lb, which is manageable, but the trips add up fast on a multi-week trip. Treat it as a travel-length limiter rather than a capacity compromise.
7. RecPro 36-Gallon Portable Waste Tank – Solid Tires, Big Capacity
RecPro RV Portable Waste Tank | 36 Gallon | Blue | No-Flat Tires
36 gallon capacity
Polypropylene body
54.9 lb empty
44.5 x 24.75 x 15 in
Pros
- 36 gallons cuts down on dump trips
- Flat-free diamond-tread tires cannot go flat
- Large ports speed up filling and emptying
- Arrives pre-assembled
- Bright blue finish is easy to spot
Cons
- Heaviest tank in the roundup at 54.9 lb
- Solid tires are harsh on gravel
- Highest one-star share of any tank here
- Only 116 ratings
The RecPro 36-gallon is the newest tank here, one of the more recent listings in the category, and it takes a direct run at the flat tire problem. It uses non-pneumatic flat-free tires with a diamond-pattern tread, which means no pinch flats on the way to a dump station, the single most common mechanical complaint in owner threads about air-filled totes.
Capacity is the other argument. At 36 gallons it covers most trailer and small motorhome black tanks in one transfer, and the large ports make filling and emptying faster and cleaner. It arrives pre-assembled, so setup at the campsite is minimal, and the bright blue finish makes it easy to spot in a crowded campground.
Sentiment here is unusually split, and the data shows it. It carries a 4.1 average with 69% five-star ratings but only 5% four-star, and 13% one-star, the highest one-star share in this group. That pattern usually means people are satisfied or not based on how they got it over rough ground, which is where solid tires cut both ways.
At 54.9 lb empty it is the heaviest tank we listed, and full it comes to roughly 300 lb. Solid tires also feel harsher than air-filled ones on gravel and rutted campground roads, which is the trade for never dealing with a flat.
Why flat-free tires are the deciding feature here
The case for solid tires is not subtle. A tote is a tank you roll across uneven ground to reach a drain, and a flat in that scenario means rolling a loaded 300 lb tank back to the trailer. Owners who have been stranded by that tend to become the loudest advocates for flat-free designs.
Where the trade shows up
Ride quality and weight. Solid tires transmit every rut, and on loose gravel they can feel like they are dragging. With the heaviest empty weight in the roundup, this tank needs the tow bar more than most. Judge it against the Barker if tire longevity has been your problem, and against the Camco Rhino if you want proven long-term ownership.
How to Choose a Portable Waste Tank That Fits Your Rig?
Match capacity to your black tank, not your gray tank. Most owners size a tote to the onboard black tank because that tank fills first and triggers the trip. A rig with a 28-gallon black tank is well served by the Camco Rhino 28 or the Venustank 30. A fifth wheel with a 32.5-gallon black tank wants 35 gallons or more, which points to the Barker 42 or the RecPro 36.
Do the full-weight math before you commit. Water weighs 8.34 lb per gallon, so a tote’s full weight is simply gallons multiplied by 8.34 plus its empty weight. A 28-gallon Camco Rhino lands near 275 lb with the tank included. A 42-gallon Barker is roughly 350 lb. This is the number that decides whether you roll, tip, or tow.
Decide how far you have to move it. Jayco Owners members who tow their totes report doing so at about 5 mph over short distances, hitched to a truck ball and bungee-corded so it cannot unhitch on a bump. Ratchet-strapping a tote to an open tailgate is a common setup. If your dump station is a steep grade away, plan on a vehicle rather than your back.
Choose wheels and tires for the ground you actually drive on. No-flat foam and flat-free solid tires never go flat but ride hard. Pneumatic rubber tires roll smoother and quieter, and iRV2 owners recommend them for a reason, but they need air and they crack with age. Plastic wheels are the loudest and roughest option on gravel.
Look for a tank rinser and vent access. Rinsing is the least enjoyable part of tote ownership, and the tanks with a built-in rinse port and combo vent connection, like the Barker, or the integrated rinser plus included rinse adapters on the Venustank, save real time and reduce odor.
Check storage and hose length. The hose in the box is often shorter than the gap between your RV outlet and where the tank will sit. Measure it, and buy an extension if needed. Also measure the tote against your storage space, and against the height of your trailer’s dump port if the tank is tall.
Do you even need a tote? This is the fair question, and iRV2 owners raise it directly. Multiple members argue that for long stays, honey wagon service is often the better deal, and one owner said a 30-gallon tote was much simpler than pulling a 30-foot trailer to the dump station. A tote earns its place on boondocking trips and at parks without sewer. It is less convincing when you sit in one place for weeks. Some owners also run a waste bladder on the tow vehicle pumped by a macerator as a lighter alternative.
How to Dump Your RV Tanks Into a Portable Waste Tank
Park the tote beside your RV and connect the RV’s 3-inch sewer outlet to the tote inlet with a standard sewer hose. Make sure the tote’s gate valve is closed before you open anything on the RV.
Open the RV’s gray water valve first to push a rinse of clean water through the lines and into the tote, then open the black water valve, then close black and open gray again to flush the remaining solids. Keep the tote vent open while filling, because air has to escape or you get slow flow, back-pressure, and odor.
Stop at roughly 85 to 90% full. Totes with an AutoStop or fill shutoff handle this automatically. Overfilling makes the tank heavier than you planned for and is the most common cause of spills in transit. Once full, cap the inlet, disconnect the hose, and rinse the hose before stowing it.
Move the tote to the dump station. Roll it, tow it, or use two people. At the receiving port, keep enough hose length to reach down over a raised curb rather than lifting the loaded tank over the lip. Open the tote’s gate valve, let it empty, then run a rinse cycle before you cap it.
How to Rinse, Treat, and Store a Portable Waste Tank
Rinse early and often. The hardest part of tote life is the black residue that sets if you leave it. Flush with a built-in tank rinser and a water hose adapter immediately after dumping, using hot water and an RV-safe detergent where the tank’s material allows it. Owners consistently say that a ten-minute rinse at the dump station prevents an afternoon of scrubbing later.
Treat the tank with holding tank treatment before you cap it. For an RV toilet system, drop-in treatment in the black tank controls odor at the source; for the tote itself, a liquid treatment left in the tank between trips does the same job. Forum threads describe the smell as the number one reason people give their tote up, and treatment is the cheapest fix.
Vent and loosen caps for storage. Owners report that leaving caps sealed in a warm trailer bakes odor into the tank. Leaving the caps cracked or the vent open, with the tote empty and shaded, keeps it manageable. Between trips, hang the tank on the RV ladder with the ladder hook, or store it low and out of the sun.
Watch for freezing if you camp in cold weather. Drain the tote fully after the last dump, because a frozen block of waste in the bottom of a tank is a genuinely bad morning. Polyethylene tanks survive cold better than most plumbing, but standing liquid does not.
Frequently Asked Questions
What is the best portable RV waste tank?
The best portable RV waste tank depends on your black tank size and how far you have to move it. For most trailers, the Camco Rhino 28-gallon is the strongest all-round pick, with no-flat wheels, a steel tow adapter and the largest owner base in the category. Larger rigs usually want 35 to 42 gallons, which points to the Barker 4-Wheeler 42-gallon or the RecPro 36-gallon. Smaller rigs with low dump ports do well with the Thetford SmartTote2 12-gallon.
How do you empty a portable RV waste tank?
Park the tote beside your RV, close the tote’s gate valve, and connect the RV sewer outlet to the tote inlet with a standard 3-inch sewer hose. Open gray, then black, then gray again to rinse, keeping the tote vented while it fills. Stop at about 85 to 90 percent full, cap the inlet, disconnect the hose, then roll or tow the tote to a dump station and open the gate valve to empty it.
How much does a full portable waste tank weigh?
Multiply the capacity in gallons by 8.34 lb per gallon of water, then add the empty weight of the tank. A 12-gallon Thetford comes to roughly 100 lb full, a 28-gallon Camco Rhino to about 275 lb, and a 42-gallon Barker to around 350 lb. At those weights, plan to roll or tow the tote rather than lift it, especially over a raised dump-station curb.
Are portable waste tanks only for black water?
No. Most owners use a tote for both black and gray water, and the standard sequence is gray first to rinse the lines, then black, then gray again. Smaller tanks, like the 10-gallon VINGLI and the 12-gallon Thetford, are commonly used for gray water only because their capacity suits a smaller gray tank. Any waste tote can carry either, as long as the fittings match your RV.
What is the difference between a 2-wheel and 4-wheel tote?
A 2-wheel tote is lighter, narrower, cheaper to store, and easier to get into a truck bed, but it tips when loaded and needs a handle to keep it level. A 4-wheel tote has a wider base with front swivel casters, stays upright on uneven ground, and pulls more easily when full. Owners with rough dump station access tend toward 4 wheels, while people with limited storage tend toward 2.
How long can you leave waste in an RV tank?
Treat it as short as possible. Waste left in a tank or tote for weeks produces odor that is hard to remove from polyethylene and can permeate the RV. Most owners dump within a few days, rinse thoroughly, add holding tank treatment, and leave caps cracked or the vent open in a shaded spot. If you are storing for a season, drain it completely so nothing can freeze.
Which Portable Waste Tank Should You Buy?
For most trailers, the Camco Rhino 28-gallon is the pick. It carries a 4.7 average across more than 27,000 ratings, its no-flat wheels and removable steel tow adapter solve the two problems owners complain about most, and 28 gallons covers a standard black tank in one transfer. It is our editor’s choice among the best portable waste tanks for RVs in 2026.
Move up to the Barker 4-Wheeler 42-gallon if your black tank is 32.5 gallons or larger and you want one trip instead of two, and if you can tolerate swapping its pneumatic tires when they crack. Choose the Thetford SmartTote 18-gallon if you want the hose and fill shutoff solved for you, the Venustank 30-gallon if you want every fitting and adapter in the box, and the RecPro 36-gallon if flat-free tires matter more to you than ride comfort.
For small rigs or gray water only, the 12-gallon Thetford or the 10-gallon VINGLI are the practical picks at under 100 lb full. Whatever you choose, check the full weight with the gallons times 8.34 formula first, and plan your route home from the dump station before the first trip, not after it.