Years back I bought a swing away rear tire rack from a Bronco planning on using it on my project GMC, but turns out it sits against my 88's rear just fine.
I HATE carrying a spare underneath the truck! Ever since I had a flat on the freeway during rush hour right after a snow storm. That was the LAST time one was mounted underneath. Now I mount the spares in the bed, usually to the rails or to my tool box next to my Gerry Can