Are large tires necessary for a prerunner? A lot of people are running 33"s and 35"s. I want to run 31"s and a camburg 5.5 performance kit and not worry about fiberglass fenders. According to camburg's website this would work. Are there advantages to running a larger tire size? As long as I go with a quality tire (BFGoodrich A?T KO or General Grabber w/red lettering) will it matter?