I am running 295/60R20 Nitto Trail Grapplers. I had some minor trimming to do but not to bad. I have a 2.5" AS level up front with the 3" block in the rear. When I get it loaded it sits nice and level. If you only go with the front you will likely have the rear sagging a little. Hope this helps and any other questions don't hesitate to ask. Good luck with the truck.