The problem with the modern rims is the setback is too deep. You end up with tires running into the tie rod ends on the front and need a 2" spacer to correct the issue.
I am running a pair of 16" rims from a 91 on the rear of my 3/4 ton. There is about an inch of clearance between the tire and frame. This is with a 7.50R16 tire, tallest my tire man could get me.
Another option is to go with aftermarket rims. Montana Andy found some white spokes with the right setback that are made for trailers.
