Venustank RV Portable Waste Tank That Are Easy to Steer and Transport Venustank's 39-Gallon Portable RV Tote Tank Kit contains everything necessary to move waste from your RV or trailer to a dump station, especially when you're parked far from an RV sewer hose. The large back wheels, made of solid rubber, ensure smooth transportation. Additionally, the tow bar offers flexibility, allowing you to either roll the tote tank like a suitcase or tow it behind a truck/golf cart.