Where are you rubbing with that setup? I am wondering if I could get away with 305/70/17's with a Tuff Country 4" lift and some judicious trimming....I just installed a skyjacker 4" suspension and a SuspensionMaxx 1.5" body lift to fit 285/70/17. Glad i added in the body lift cause i still get slight rub when turning. I have 4.5 backspace wheels to clear the lift spindle. I think a backspace of 4.75" or less is needed to clear the spindles. My tires stick out past Z71 fender flares. Check out tiresize.com and wheelsize.com for some good info on wheel tire specs.