Here's a picture of the mount. It's a 4in. u clamp with 2 small steel plates with rubber on the underneath side to protect the bumper. On the connecting steel plates are 2 small clamps that hold 3/8in. allthread bent at 45* angle. I have 2 hollow metal tubes that I slip over the allthread for extra support. The all thread is very stable as the towel holder will hold 6 large wet towels. The frame is made of 3/4 in. pvc with holes drilled on the inside/outside for the nylon string/rope to feed through. I strung it before final assembly as it was a lot easier to tighten the rope as the pvc flexes. I'm sure there's an easier way to mount to the bumper, but I made it out of stuff I had in the garage.
http://www.jaycoowners.com/forums/at...1&d=1413940593