I own a 2008 SR5 2x4 v8 and went online to look up the ground clearance. I have the upgraded 17inch alloy's and the stock Michelin's. Many sites such as 2008 Toyota 4Runner specs, auto safety at Edmunds seem to think there is 8.7" minimum. I went and measured myself and the lowest point (at the skid plate) was 7.5". Why do all of the car sites say 8.5"+ minimum ground clearance??