Answering the common search for reliable external RV holding tanks, these selections cover wheeled tote tanks and stationary holding tanks for black water or waste/gray water. They’re ideal for RV owners who need portable waste disposal, or replacement tanks when existing systems aren’t practical. The top picks vary by capacity, mobility, and installation needs, helping you choose based on traveling style and campsite access. The buyer’s guide below highlights practical considerations to help you compare options side-by-side.
| Product | Capacity | Best For | |
|---|---|---|---|
| Camco Rhino 36-Gallon Tote Tank | 36 Gal | Longer trips with distant dump stations | Heavy-duty wheels; steel tow adapter |
| Camco Rhino 28-Gallon Tote Tank | 28 Gal | Compact, versatile transport | Steerable wheels option on similar model |
| RecPro 43 Gallon RV Holding Tank | 43 Gal | High-capacity stationary solution | Made in USA; rotomolded durability |
| classAcustoms WT-3161 31 Gal Black Water Tank | 31 Gal | Concession/ Camper setups needing stationary tank | Installation specifics; not for fresh water |
| classAcustoms WT-1653 16 Gal Black Water Tank | 16 Gal | Smaller RVs or upgrades | Same installation considerations as larger models |
Camco Rhino 36-Gallon Tote Tank
- References features like large no-flat wheels, a built-in gate valve, and a removable steel tow adapter with a 3’ sewer hose kit for RV waste disposal.
- Best for: RV owners who frequently need to move waste long distances from the black water tank to a distant dump station.
- Why selected: High capacity and rugged transport make it suitable for sites without readily accessible dump hookups.
- Caution: Weighs 45 lb empty; consider vehicle capacity and handling when full.
Camco Rhino 28-Gallon Tote Tank
- Highlights similar heavy-duty wheels and a steel tow adapter, but at a smaller capacity (28 Gal).
- Best for: Campers or RVers who want a portable option with easier storage when not in use.
- Why selected: Balanced size and portability for mid-length trips or limited storage spaces.
- Caution: Smaller capacity means more frequent dumps on longer journeys.
classAcustoms WT-3161 31 Gallon Tank
- Features 31 gallons for black water holding; MDPE resin construction; not for fresh or drinking water.
- Best for: RVs needing a ready-made stationary black water tank with clear installation requirements.
- Why selected: USA-made credibility and robust design suitable for fixed installations on RVs or tiny houses.
- Caution: Installation guidance notes venting and non-movable outlet, with hardware not included.
classAcustoms WT-1653 16 Gallon Tank
- Highlights 16 gallons for compact RVs or upgrades to smaller rigs; same MDPE material and installation considerations as larger models.
- Best for: RVers with compact spaces or those needing a lighter, more maneuverable wastewater tank.
- Why selected: Adds a scalable option within the same product family for varied RV sizes.
- Caution: As a smaller tank, it requires planning to avoid frequent dumping during trips.
Camco Rhino 28-Gallon Portable Tote Tank (39004)
- Notes steerable front wheels and large rear wheels, with a 24.5″ L x 13″ W x 44″ H profile and 53 lb weight (empty).
- Best for: RVers who want steerable transport for easier handling on uneven surfaces.
- Why selected: Clear advantage for maneuverability in tight campsites or off-road-friendly lots.
- Caution: Heavier when full; ensure towing method supports the load.
Buying Guide
What type of external RV holding tank is right for you?
Portable tote tanks are ideal for users who need to move waste between the RV and a distant dump station or when sewer hookups are out of reach. Stationary holding tanks are better for long trips with a steady dump plan and for replacing worn tanks in place.
Capacity considerations
Higher capacity reduces frequency of dumps but increases weight and bulk. Choose 28–36 gallons for frequent travel and far dumps. For smaller RVs or limited storage, 16–31 gallons may be more practical.
Mobility and installation
Wheels and tow adapters improve portability. Steerable wheels help in tight spaces, while a tow bar simplifies transport behind a truck or golf cart. If you’re selecting a fixed tank, review inlet/outlet placement and ensure a proper venting setup.
Material and durability
Most external tanks use UV-stabilized HDPE or MDPE resin. Look for rotomolded or reinforced constructions for longevity in outdoor use and exposure to sun and weather.
Best practices and safety
Ensure the tank is vented during use to avoid air pressure buildup. Follow manufacturer guidance for fittings, prevent over-tightening, and verify compatibility with your RV’s valves and piping.
Installation compatibility
For stationary tanks, confirm fittings and pipe sizes align with your RV’s system. Some models specify non-inclusion of dump valves or hardware, requiring separate procurement and professional installation if needed.
Maintenance and care
Rinse and sanitize tanks as required by your RV’s waste system protocol. Inspect seals and connections for leaks before and after trips, especially at joints and valve interfaces.
Frequently Asked Questions
- What capacity should I choose for my first external RV holding tank? A 28–36 gallon tote is a versatile starting point for many RVers, balancing capacity and transportability for various camping scenarios.
- Can I use a tote tank for gray water or only black water? Most tote tanks are designed for black water or waste/wastewater use; verify the product’s intended application in the features and installation notes.
- Do these tanks come with hoses or disposal hardware? Some listings include hoses and tow adapters, while others require separate purchases; check each product’s feature list and included items.
- Are these tanks easy to install on a small RV? Stationary tanks require proper venting and fitting alignment; portable tote tanks are generally easier to deploy without permanent installation.
- Is professional installation ever required? For fixed tanks with complex inlet/outlet configurations, professional installation may be advisable to ensure proper venting and leak-free operation.
- What maintenance is recommended? Regular rinsing, inspecting seals, and following the manufacturer’s cleaning guidelines help prevent odors and leaks over time.