I'm running 38x15.50R20 Toyo M/Ts on a 20x10 (-19) and have pretty much no rubbing issues on an 8" kit (7" Icon with TEI). I think it might rub a little on the control arm at full lock in certain situations, and we had to grind down the bumper bracket in the front a bit, but didn't trim anything at the back corners of the wheel well. I'm debating going to 40" Toyos. I'll need to trim for sure, but I think it could fit. I think I would like the way the 40s would look better than the 38s(they seem a little too small with this much lift on these trucks), but I am enjoying not having it rub every time I turn into a parking lot.