PMD Products RV 4" Bolt Bumper Hitch Mount Receiver Adapter 3500lbs towing cargo bike rack for Camper Motorhome Steel welded construction works on 4" square RV Bumpers Powder-coated rust resistant finish, Zinc Plated Hardware 3500lbs Gross Trailer weight, 350lbs Gross Tongue Weight Rating, Class II Can mount above or below RV bumperCan mount above or below RV bumper 2" Receiver Tube accepts ball mounts, bike racks, toters, cargo racks etc