I just purchased a 2002 Chevy 2500hd to tow my 30' - 7,000lb trailer. I have two questions which I need help on. First, does anyone know what the stock height of the truck is, from the fenders? Second, If my trucks lifted (it's 41" at both the front and back) would it make sense to lower it back to the stock height? Will it put additional stress on the transmission and engine?