I decided to redo it since I plan on doing an Exo-cage. I used 1-3/4, .120 walll DOM. About 30ft of it. 2x2 square tube with two 3/4" bolts and two 5/8" bolts hold it on. The clevis hooks are 3/4". This is the first project with my tubing bender. I also widened my hummer wheels 3".