I purchased a j bolt from a 1987 ramcharger and plan to drill two holes in the inside rail of the bed to mount my 315 70 17 spare.
Right now its is laying in the center of the bed but soon, before the end of this year I'll get it mounted.
My delay is the need to verify if the sheet metal of the bed requires some reinforcement. On the old ramchargers, the assembly bolted to the inside of the bed frame but it was a solid body whereas the truck bed might be a different thickness. I'm measuring metal thickness and determining if I need to reinforce.
With the j bolt, the loop of the j goes through 2 holes and the long end of the j goes through the wheel stud or center, they used both methods, and tightens down with a conical shaped plastic hold down. It's simple and effective. If mounted up against the rear window or on one of the bed sides, probably passenger, it would be mostly out of the way.
My thoughts. With a 315 70 17, essentially a 35, it's a bit more challenging. I have a topper on the bed, so it's secure but it's bulky.