from my trailer build thread (spare carrier bracket from Jeep Grand Wagoneer)
I wanted to mount the spare under the frame, so it hit me this past weekend that I could recycle the spare carrier from my
wife's rig, since her 33" BFG's are too big to use the stock spare carrier now. It looked like it was going to work, here's the first mock up. It was too far forward and interfered with the kickstand so it had to be moved towards the axle a few inches.
The "hub" section of the spare carrier is not really doing much, but when I tighten the strap up, the tire gets sandwiched fairly securely up against the diagonal frame members.
Here's how it looks from above in its final mounting spot. It doesn't interfere with the parking brake cables either.
Tightening the bolt on the right draws the strap up.
Here's the other side of the strap that has a double hinge. I simply welded some tube on the underside to accept the linch pinch that is secured with a cotter pin and under tension of a compression spring.