July 12, 2011I tow a travel trailer. I want to use my bike rack to haul our bicycles. The rack is made for a 2" receiver. The trailer has a 4" bumper. Has anyone used any of those rv bumper hitches class III 2" receivers that bolt onto the bumper of the trailer? I found one made by Curt manufacturing and another that is just two u-bolts. The one from Curt looks better to me, but I wanted to see if anyone had experience with these.