Trent asked about this, figured I'd post it if anyone else can use the idea. I have this hitch rack https://www.harborfreight.com/500-lb...ier-66983.html mounted in the back of my Jeep using a piece of Superstrut from the home depot, two u-bolts, two turnbuckles, two quick-links for chain, and four bolts that originally held the seat belts in. Also four furniture feet mounted under it with four self-drilling bolts to protect the paint, the indent at the center of the feet keeps the screw head off the body. Basically a bunch of stuff I had sitting around... I hope the pics explain it, they're uploading in random order and my Jeep is a little muddy, but it's pretty simple. The only holes I made were for the quick-links, and it all can come out pretty fast. It works like a trunk too, I have a tool box mounted infront of it and with the tailgate locked it's pretty secure.
One of the pics is the Superstrut section of the electrical aisle at Home Depot. If you haven't seen this you should! Great brackets, special nuts and all sorts of cool stuff for making racks and mounting things.