Nonono, the brackets inside the body are spot-welded to the body and then the rest of the body is spot-welded around them. The tire carrier bolts on, yes. The interior brackets with the captive nuts that the bolts go INTO, however, are spot-welded in.
On the 91 the upper and lower hinge brackets were bolted in on the inside. I know, because I unbolted them and removed them from the truck myself. Maybe it had been added as a dealer option on this particular truck and they had bolt in brakets for that, I don't know, but they were not welded at all.