Gotcha. I guess I never used it before since I never towed heavy enough to be concerned. With that said I guess it's worth the money to have for the piece of mind
My biggest advice for tuning an unstudded 6.0.... don't even hammer on the throttle at all until it is 100% up to operating temperature. I would stick with a mild tune too, something like a normal street tune. Every time I popped gaskets it was shortly after I loaded my hot tunes in again.