I ran a 32 x 11.50 x 15 on a 10" wide rim with 4.5 backspace on rim

ran 275/60/15 on same rim

I think I had a 33 x 12.50 x 15 on the rear of my stepside with that rim also.

been a while, in my 88-440 truck I have the A-body rear axle with 12" wide rim with 4.5 back space 29 x 15 x 15 M/Ts now. tubbed but in the fender.

on ALL my trucks the fronts stay with a 235/75/15 on 8" wide with 4" back space. except the 440 truck-it gets a 215/75/15 up front.