Then what happens when you load up a truck with a 3000 lb slide in camper?? The drive shaft angle changes by a considerable amount but this has no effect on the drive line or axles. I had 4 truck campers through the years and never had any trouble with any of my F250's. I think you would have to lower the rear of the truck by removing the blocks on top of the axle, then load a significantly heavly load directly in the bed of the truck to do what you are saying. The back of the truck would have to really squat to do that don't you think? To remove some of these blocks on the axle that the springs attach to thus allowing the bed to lower would be my choice. The pin weight of my 5th wheel is 1600 lbs and this is not near enough to significantly cause the truck to squat. The bed height of my 05 Ram 2500 2WD is 33 inches as it sits in my garage. The bed height of a new truck I looked at a few weeks ago was 41 inches...a full 8 inches higher than my truck!! Why do vehicle engineers have to design a truck to high off the groudn? Not everyone is going "offroading" and need so much ground clearance. If you look at the spacers they put between the axle and springs it looks profane!!