I have and have had bags on my trucks. Biggest thing they ADD capability to keeping it level and then that helps keep the trailer level and as a result may improve the areodynamics of the load since high front end causes more air resistance (?) low front on trailer increases resistance from the trailer (?). This all supesition but it does sound reasonable. My SIL has the v6 with turbos dont think he has/had bags just bought a new truck no towing yet but when he did tow it really did not squat. So you might want to weigh the truck with trailer and then see if you can determine hitch weight to see if too much weight is foreward on truck.