I know this post is a bit old and OP probably already has tires, but for future interested people... Checkout my post #3666 here: http://www.toyota-4runner.org/4th-gen-t4rs/51742-lift-tire-central-pics-post-em-up-245.html
I love the Cooper S/T Maxx in the 255/80. I moved the front fender liner forward and removed mud flaps and no rubbing with normal driving (including reverse, downhill). I don't contact the body mount at all with the 255s with 4.5" backspace wheels. Haven't been off-road yet with the new setup, but as a previous poster mentioned the Coopers are 32.8" so these are similar diameter to the 285/70s everyone runs, expect little to no issues.
