I too am running 32" BFG tires on 15x8 rims with 4" backspacing (stock is 4.5"). What I had to do is crank up the torsion bar by .75", and remove the mud flaps. Even so, I had to becareful whenever turning into a steep parking lot. If you really must keep your mud flap, you'll need to crank up the torsion bar by at least 1". For now, I'm happy with it as it only rubs less than 1% of the time. I plan on doing a body lift and suspension lift later this year.

02 Tacoma Double Cab TRD Prerunner .. just added 3" lift .. more to come