I wanted a way to mount an extra tire in my bed. This is what I've come up with. I have 2 - 1/2 by 6 inches carriage bolts. They do not fit in the bed cargo rail until you grind/file flat spots on a top and bottom of the head. They should slide in fairly tight. Put a fender washer, lock washer, and wing nut on each, leave kinda loose. Put the wheel facing toward the cab and put the bolts through 2 lug holes. Put a fender washer and wing nut on each and snug down. Reach around and tighten the first ones against the rail. Stays tight and is easy to remove when needed. ......................................................................