Ultra-Fab Products (48-979015 Rigid Skid Wheel Hitch mount skid wheels Designed to bolt to the motorhome's hitch bar No drilling or welding is required, only 2 wrenches are needed Rigid steel universal caster fits both 2-1/2" and 3-1/2" hitch bars Ultra-Fab Products Ultra Rigid 4 inch Skid Wheels Extra strong metal wheels with roller bearings and 1/4-inch urethane on outer edge Prevents tail dragging and digging while backing up Helps protect undercarriage from damage Hitch mount up to 30 feet Easy bolt-on installation; Two per box 1 year manufacturer warranty