Article Type: Product Recommendation
Author: RV Pro Solutions (Certified NRVIA Inspector Insight)
Applies To: RV gray- and black-water transfer when the campsite sewer connection is not directly accessible
Overview
The Camco Rhino model 39002 is a 21-gallon portable waste tank used to move RV holding-tank contents to an approved dump point when the RV cannot be positioned at the station. Camco identifies the tank as UV-stabilized, blow-molded high-density polyethylene and provides wheels and waste-transfer accessories for portable use.
A portable tank can save a campsite move, but 21 gallons of wastewater is heavy and requires deliberate handling. Capacity, route, towing speed, slope, and storage space should be considered before filling. All connections should be secured, and sanitation gear should remain separate from potable-water equipment.
Camco Rhino 21-Gallon Portable RV Waste Tank (39002)
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Key Features
- 21-gallon capacity is suited to transferring a portion of an RV holding tank.
- Blow-molded, UV-stabilized high-density polyethylene tank construction.
- Large wheels and a tow handle support movement over typical campground surfaces.
- Integrated fittings and included accessories support filling, transport, dumping, and rinsing.
- Low-profile portable format stores outside the living space when properly secured.
RV Use Cases
- Transferring gray water from a campsite to an approved dump station.
- Moving black-water contents when direct sewer access is unavailable.
- Managing holding-tank capacity during longer stays without relocating the RV.
- Supporting service or maintenance tasks that require controlled wastewater transfer.
Practical Advantages and Limitations
Advantages:
- Portable transfer can avoid breaking camp solely to reach a dump station.
- Large wheels are practical on many gravel, dirt, and paved campground routes.
- Dedicated fittings organize the fill, vent, tow, dump, and rinse process.
Considerations:
- A full 21-gallon tank is very heavy and can be difficult to control on slopes or rough ground.
- The tank may retain a small amount of liquid after dumping and requires thorough rinsing and drying.
- Towing is limited to safe campground use and must follow the manufacturer’s instructions and site rules.
- Capacity must be monitored closely because overfilling can cause spills and sanitation hazards.
Best Practices
- Plan the route: Confirm the approved dump point, surface condition, slopes, and campground rules before filling.
- Estimate volume: Transfer less than the tank’s rated capacity and stop early enough to prevent overfilling.
- Secure every fitting: Inspect caps, seals, hose connections, and the tow handle before moving the tank.
- Move slowly: Hand-pull when practical and follow Camco’s instructions if using the tow adapter.
- Rinse responsibly: Clean the tank and accessories only at an approved sanitation area using non-potable equipment.
- Store it safely: Drain, dry, cap, and secure the tank outside the living area and away from freshwater gear.
Inspector’s Note (RV Pro Solutions Insight)
If you enjoy staying at campgrounds that don't have full hookups, one accessory I'd definitely recommend considering is a 21-gallon portable RV waste tank. It's one of those items that can make a big difference in how long you're able to stay at a campsite without having to pack everything up and move your RV just to empty the holding tanks.
The biggest advantage is convenience. Instead of breaking camp when your gray or black tank starts getting full, you can transfer some of that wastewater into the portable tank and transport it to the campground's designated dump station. This is especially helpful when you're staying somewhere for several days or longer and want to make the most of your time without worrying as much about your holding tank capacity.
One thing I'd pay attention to when choosing a portable waste tank is build quality. Look for durable construction, sturdy wheels, secure fittings, and a reliable drain valve. Remember, 21 gallons of wastewater can weigh around 175 pounds, not including the weight of the tank itself, so you want something that's built to handle the load and is easy to maneuver. A good-quality tank that's properly maintained should provide years of dependable service.
My advice is to consider a portable waste tank if you frequently camp without sewer hookups. Just be sure to follow the manufacturer's instructions, avoid overfilling it, and use proper sanitation practices when transferring and disposing of wastewater. It's a practical investment that gives you more flexibility in choosing campsites and can help extend your stay without having to move the RV.
For us, it's all about making camping a little more convenient and spending more time enjoying the campsite instead of worrying about when we'll need to head to the dump station.
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