If you’re outfitting a trailer, motorhome, or camper, you need reliable potable water storage that’s easy to install and sanitary. This guide highlights five top water tanks designed for RV and trailer use, focusing on size, installation flexibility, and material safety. The best picks target different traveler profiles—from weekend campers to full-time van lifers. Each option emphasizes durability, code compliance, and practical fittings to fit common RV plumbing. A quick summary table follows to help you compare at a glance.
Summary Table: Top Trailer Water Tanks
| Product | Capacity | Best For | |
|---|---|---|---|
| Ameri-Kart 20 Gallon WT-5546 | 20 Gallons | Compact RVs, smaller trailers | Two 1.5″ and two 0.5″ fittings for flexible install |
| Ameri-Kart 36 Gallon WT-5549 | 36 Gallons | Medium to large RVs | Ample capacity with multiple fitting options |
| Class A Customs UM-3000 | 30 Gallons | Concession or extended-use trailers | Under-mount design with versatile mounting |
| WaterPrepared 35 Gallon | 35 Gallons | Outdoor adventures and camp setups | UV-protected plastic and garden-hose spigot |
| Chapin 40-Gallon | 40 Gallons | Large lots, irrigation-backed RV tasks | Translucent, chemical-resistant with quick drain |
Ameri-Kart 20 Gallon RV Fresh Water Tank
Best for compact trailers and smaller RVs, this 20-gallon tank is made in the USA from BPA-free materials and designed for potable water use. It includes multiple installation options with two 1.5″ balloon-style NPT fittings and two 0.5″ NPT fittings, allowing flexible placement in tight spaces. The tank is built to be sanitary and leak-proof, meeting IAPMO standards. Choose this if you need a space-saving solution without sacrificing water safety. Caution: verify your mounting clearance in very tight compartments before purchase.
Ameri-Kart 36 Gallon RV Fresh Water Tank
Better for mid-size RVs or trailers needing additional storage without extending length excessively, this 36-gallon tank uses BPA-free materials and offers convenient built-in fittings. Its larger capacity supports longer trips between fills while maintaining hygiene and leak-proof integrity. Best for families or longer excursions. Limitation to note: larger footprint may require more under-vehicle space than smaller tanks.
Class A Customs Under Mount 30 Gallon UM-3000
Best for under-mount installations in larger trailers or concession setups, this 30-gallon tank can be oriented in multiple ways since it sits on any side. It uses NSF-approved materials for potable storage and includes dual 1.5″ and 0.5″ fittings. This makes it a practical choice for installations where space and orientation flexibility matter. Avoid over-tightening fittings to prevent damage to tank seams.
WaterPrepared 35 Gallon Portable Water Tank
Designed for outdoor and camping use, this 35-gallon tank features UV-proof plastic to prevent water degradation and includes a standard garden hose spigot for easy retrieval. It’s well-suited for campers who need a ready-to-use, outdoors-oriented solution with simple refill and discharge. Consider this option if you frequently rely on external water sources and want a straightforward hookup.
Chapin 40-Gallon Water Storage Tank
Best for larger capacity needs, this 40-gallon tank is translucent and chemical-resistant, making it suitable for irrigation or large RV tasks in addition to potable storage. It features a built-in 2″ drain and a garden-hose port for quick emptying. Choose this if you require easy visibility of water level and quick draining for maintenance. Limitation: bulkier profile requires adequate storage space under the RV or trailer.
Buying Guide: Key Considerations For Trailer Water Tanks
- Capacity vs. space: Align tank size with your travel plans and storage space. Smaller rigs benefit from 20–30 gallons; larger rigs can justify 35–40 gallons.
- Material safety: Look for BPA-free plastics and NSF/IAPMO-compliant construction when storing potable water.
- Fittings and installation: Favor tanks with multiple fitting sizes (e.g., 1.5″ NPT and 0.5″ NPT) and flexible mounting options.
- Mobility and access: If you travel off-grid, consider a tank that’s easy to lift, drain, and refill, with a convenient spigot.
- Durability: Weather resistance and impact resistance are important for road vibrations and exposure to the elements.
- Maintenance: Translucent tanks or clear markings help monitor water quality and cleanliness; built-in drains speed maintenance.
Frequently Asked Questions
- What size RV water tank should I choose for weekend trips?
For weekend trips, a 20–36 gallon tank often provides a good balance between storage and space constraints.
- Are these tanks safe for drinking water?
Yes, the selected models use BPA-free materials and are designed for potable water in RVs and trailers. Always verify NSF/IAPMO standards.
- Do tanks come with standard installation fittings?
Most models include multiple fittings, typically 1.5″ and 0.5″ NPT, to support various installation layouts.
- Can a tank be mounted on its side?
Some tanks are designed to sit on any side, but always follow manufacturer guidance to avoid leakage or stress on fittings.
- Is a larger tank always better for RV travel?
Not necessarily—larger tanks require more space and add weight. Choose a capacity that fits your typical travel pattern and water refill options.
- What maintenance is needed for RV water tanks?
Regularly inspect fittings for leaks, ensure the tank remains clean, and flush with potable water to minimize buildup and odors.