The best trailer water tank depends on whether you need potable water, general liquid storage, or a portable tank for RV waste. The Ameri-Kart 20-gallon tank is designed for RV fresh water, while the WaterPrepared 35-gallon tank offers portable storage. The RomoTech 26-gallon tank suits utility tasks. The Camco Rhino models are waste totes—not fresh-water tanks—and are included for campers needing to carry wastewater to a dump station.
| Product | Best suited for | Capacity |
|---|---|---|
| Ameri-Kart RV Fresh Water Tank | Potable water in an RV or trailer | 20 gallons |
| WaterPrepared Portable Utility Tank | Portable water storage | 35 gallons |
| RomoTech Square Storage Tank | General-purpose liquid storage | 26 gallons |
| Camco Rhino Tote Tank 36-Gallon | RV wastewater transport | 36 gallons |
| Camco Rhino Tote Tank 28-Gallon | Lower-capacity wastewater transport | 28 gallons |
Ameri-Kart 20-Gallon RV Fresh Water Tank
Best for: Trailer and RV owners who need a tank specifically identified for potable water. Its stated uses include drinking, cooking, showering, dishwashing, and cleaning.
The cube-shaped tank measures 21 by 17 by 14 inches, which gives buyers defined dimensions to compare with an available installation space. The listing describes BPA-free construction, weather- and impact-resistant plastic, and built-in fittings: two 1.5-inch female NPT fittings and two 0.5-inch female NPT fittings. It is also described as made in the USA and meeting IAPMO standards.
Why it stands out: It is the clearest choice here when the priority is a fixed potable-water tank for a trailer. Limitation: Its 20-gallon capacity is lower than the portable 35-gallon option, and buyers should check fitting and mounting requirements before purchase.
WaterPrepared 35-Gallon Portable Water Tank
Best for: Buyers who want a larger portable water reserve for camping, road trips, or emergency storage. The horizontal tank holds 35 gallons and weighs 16 pounds when empty.
Two handles support carrying, and the product description says its compact footprint is suitable for ATV or camping-trailer attachment. The blue, UV-proof plastic is described as helping protect stored water from sunlight penetration. This makes it a better fit for portable storage than a tank intended for a permanent plumbing installation.
Why it stands out: It provides more stated capacity than the other water-storage options in this list while remaining portable when empty. Limitation: A full 35-gallon tank contains a substantial load, so verify the trailer’s available space and carrying capacity. The listing does not specify built-in plumbing fittings.
RomoTech 26-Gallon Square Storage Tank
Best for: Trailer owners needing general-purpose liquid storage for compatible non-flammable liquids, such as water for irrigation or job-site tasks. The tank is a 26-gallon horizontal square reservoir.
Its rotationally molded medium-density polyethylene is described as rust- and corrosion-resistant, with UV stabilization for outdoor use. The translucent tank and molded gallon and liter graduations make it easier to estimate the remaining contents without opening it. The manufacturer lists uses including farms, trailers, pressure-washer setups, and irrigation.
Why it stands out: The graduated markings are useful when monitoring stored liquid, and the square shape may suit some trailer layouts. Limitation: The product description identifies it for non-flammable liquids but does not specifically establish it as a potable-water tank. Choose the Ameri-Kart model when drinking-water use is required.
Camco Rhino 36-Gallon RV Waste Tote
Best for: RV campers who need to transport wastewater from a black-water tank to a dump station when the sewer connection is out of reach. This is a waste tote, not a fresh-water tank.
The 36-gallon model has no-flat wheels, an oversized handle, and a steel tow adapter for towing behind a truck or golf cart. Its listed dimensions are 24 1/8 by 14 3/4 by 44 7/8 inches, and it weighs 45 pounds. The tank is made from UV-stabilized blow-molded HDPE, according to the product details.
Why it stands out: Choose this if wastewater capacity is more important than a lighter, smaller tote. Limitation: Its 45-pound empty weight and large dimensions require storage space and a suitable way to move it.
Camco Rhino 28-Gallon RV Waste Tote
Best for: Campers who need a portable wastewater tank but prefer the lower capacity of the two Camco options. Like the 36-gallon version, it carries RV waste to a dump station; it is not intended as a fresh-water tank.
Features include heavy-duty no-flat wheels, an oversized handle, a removable steel tow adapter, and a built-in gate valve. The listing also includes a 3-foot sewer hose and other RV accessories. Its stated dimensions are 14 1/2 by 24 by 44 inches, and its empty weight is 43 pounds.
Why it stands out: It offers a smaller waste capacity and includes a sewer hose. Limitation: It still weighs 43 pounds empty, and its capacity is eight gallons less than the larger Rhino model.
Buying Guide: How To Choose A Trailer Water Tank
Do you need potable water or general storage?
Start by identifying what the liquid will be used for. The Ameri-Kart listing specifically describes potable-water use. The WaterPrepared tank is presented as water storage for activities such as camping and road trips. The RomoTech tank is described for compatible non-flammable liquids, so do not assume it is suitable for drinking water based on the available product details.
How much capacity should a trailer tank hold?
Compare capacity with the amount of water or wastewater you expect to use between refills or dump-station visits. The listed water-storage choices hold 20, 26, and 35 gallons. The Camco waste totes hold 28 and 36 gallons. Remember that a full tank adds a considerable load; check trailer capacity and securement needs before hauling it.
Will it fit and connect to your trailer?
Measure the intended space, including room for fittings, hoses, and access during installation or filling. The Ameri-Kart listing provides tank dimensions and fitting sizes. The WaterPrepared tank has handles and a portable design, while the RomoTech listing highlights a horizontal square shape and level markings. Confirm the product’s connection arrangement against your setup.
Should you choose a portable tank or an installed tank?
A fixed fresh-water tank suits a plumbed trailer setup; a portable tank can be carried or positioned as needed. Waste totes are a separate category for moving wastewater to a dump station. Keep fresh-water equipment distinct from wastewater equipment to avoid confusion and contamination.
Frequently Asked Questions
Which listed tank is specifically intended for potable water?
The Ameri-Kart 20-gallon tank is described for drinking, cooking, showering, and other potable-water uses.
Which option holds the most water?
The WaterPrepared portable tank has the highest stated water-storage capacity at 35 gallons.
Are the Camco Rhino tanks fresh-water tanks?
No. Both Camco Rhino models are portable RV waste totes for transporting wastewater to a dump station.
Can I use the RomoTech tank for drinking water?
The provided product details describe it for non-flammable liquids but do not specifically identify it as a potable-water tank. Choose a tank explicitly listed for potable water when drinking-water storage is needed.
What should I check before mounting a tank on a trailer?
Compare the tank’s dimensions and fittings with the available space, then verify that the trailer can safely carry the tank when full and that it can be securely mounted or transported.