My 2" spacer lift, a 3" body lift, 15x7" rims with 2.75-3" of backspacing? 31's should go on with no rubbing at all, no cutting and 32's might rub a little with no cutting. I would suggest 3.75" or so of backspacing instead of 2.75" though. 32's would probably clear nicely with 15x7 rims with 3.75" of backspacing... If you stick with less backspacing like 2.75", the tires will stick out further from the fenders, will throw more muck and rocks up the sides of the body, and will rub the back edge of the front wheel wells as well as possibly the front edge of the rear wheel wells and the rear fender lip on full stuff...