Nice Truck!!! I just bought my 2012 F250 XLT FX4 screw and just installed 285/75R18 comes out to 35.1x11.4R18 Toyo MT's raised the truck up about 2" and bumped the tires out about 1/2" on both inside and outside edges. Looks great. Installed last night so no pics yet but i can tell you theres more room to go up if i wanted but not over 12" wide that would be the biggest problem plenty of room for full flex as well