First off , Nice Truck.
I am in the same situation with my 84.
I have 16.5 Super Swampers also.
Your best bet is buy a set for street use.
Get away from the 16.5 tires and rims.
Just use those for offroad till you wear them out .
16.5 stuff is hard to find and Pricey if you do.
I tried to sell them at a swap meet one time
I could not even give them away
.