One of our members, named CapriRacer, has Barry's Tire Tech, and a special page called
16.5" Tires. You'll see that the very popular LT225/75R16E tire, that most of our Class C's with dual rear tires use, is a great replacement for your 8.75R16.5 tires. If you want cheap, you can get those 225's for $100, maybe less.
OK Wheels! You need to match Number of Holes, Hole Spacing (bolt circle) and how the wheels are "piloted" meaning on the center hole or on the bolts.
The "Offset" information on Barry's refers mostly to dual rear wheels, where Offset relates to the required space between dual sidewalls.
Still, you need to match Offset on single wheels, too. Lay the Wheels (or Wheels with inflated tires) on a flat surface facing the same way, and measure from Surface to the same Hole on both wheels. If they match you're good to go. Too much or too little Offset on the "New" wheels can lead to the tires rubbing on the inside or outside sidewalls.
Chavy/GMC "3/4" or "1-ton" pickup or van should be candidates. Wrecking yards use a service called "Hollander Interchange" to investigate What fits What.
