Just as a matter of passing, Fo*d and Dodge both used what you are calling "3/4 ton" wheels right until the switch to metric in the 1998 - 2000 period on some 1 ton trucks. I have found them from 6" - 10" wide and 15" to 17". I don't what was used on Chevrolets. I know this doesn't help, and 3B is probably exactly right about a hub swap.
Les
