i have one of these at home in NC but it is a short bed with the big chrome back glass. i love the rear fender wells in these truck you can put a tire under this thang and you will hit the leaf spring before you hit the inner fender
i had a problem similar to yours it only happen every once and a while. after months of worrying and cussing i figured it out. i had a rear brake caliper that was not releasing all the way and after hard run ie....75-80 it will overheat and start sticking to the rotor. replaced it and never had...