The Rhino Bumper Mount Tote Tank Holder securely holds your Rhino Tote Tank onto standard RV bumpers and fits both 4-inch and 4-1/2-inch bumpers. It’s perfect for RVs without ladders. The holder is constructed of powder-coated steel with zinc-coated hardware for durability. Holds all four Rhino Tote Tank sizes (15, 21, 28 and 36 gallons) and is also compatible with most portable waste holding tanks on the market. Includes straps to secure your tote tank in place.