There's a lot of stuff on top of the plastic inner-fender panel which kept us from raising the wheel opening. The ECM is mounted about half way up the rear portion of the fender arc, so this also limited us. We're using Michelin 395/85R20 XML tires, which are 46.7 inches tall. The plan is to trim and bumpstop the truck to fit these tires with the Tuff Country 6-inch suspension lift. Tall tires with short lifts are the rage because they work so well off road.