I just took mine off to sand blast and repaint as it has had a hard and long life, but when it is on my CJ, it is mounted to the back bumper - usually flipped as compared to the pic below. Studs were welded through holes in the 1/2 wall stainless tube bumper just for mounting the jack and I use a bushing, two washers and a lock-nut to keep it on tight and rattle free. The bolts are the same size and thread as my lug nuts and I have thought about holding it on with a regular lug-nut and one locking lug-nut or two lockers as a theft deterrent, but as of yet no one has been foolish enough to attempt to walk away with my hi-lift