Solid stock for the pivot and a tight fitting piece that goes over it. Its been carrying a 35" tire on and offroad for a few years now and zero problems. I don't have a writeup as it was thrown together at the spur of the moment. The small square tubing was actually dumped off the side of the road onto my property and I cleaned it up and have found three uses for it thus far. I'm in the works of designing another one that'll hold a small atv winch in the rear so whenever I get around to it I will do a write up on that.
Luck Favours The Prepared