I just put 33/12.50/15 duratracks on some 15x8 wheels with @4" backspacing on my 89 BII. Stock suspension in front and some air shocks in the back. Checked to see how and where they were going to rub.
Once I saw where they were going to rub in the fronts, I installed a set of 3" lift springs that I had laying around waiting for more lift parts. I cut roughly a half coil off each and installed them in place of the stock worn out front springs. (front tires actually sit straight, but getting an alignment anyway)
This gave me the clearance I need so far for normal street driving and am able to turn lock to lock without rubbing, even going over a few speed bumps and curbs lol. The rear is clearing under normal driving with the air shocks, but the stock rear springs are so soft (worn out) that even some small bumps caused the tires to touch the fender at the top.
In the process now of deciding on what rear spring pack to switch to, use blocks, or use the 2" body lift I have stored away somewhere. I like the big tire/low lift look and am trying to accomplish the clearance issues without cutting or spending a lot on a lift and end up with a huge gap between the tires and body. Basically trying this step by step to see what works for me and how to get there.
Disclaimer: Just my 2 cents, your mileage may vary, consult your Doctor before trying this, could cause explosive uncontrollable diarrhea and other serious side effects.