tclederman, because the suburbans used the rear mount gas tank about the only place for a spare was in the truck.
See post #110 on this thread for a photo of a '72 spare tire well
~ photo of a '72 spare tire well

Always glad to help Roadmarks. I built some mini-tubs for my step side using a trailer fender from the local farm supply store and some stock angle strips from Mar-k to flange the trailer fender. Here's a photo, might be food for thought on your project. Building Mini-Tub ~ Completed Mini-Tubs