Have you switched from friction sway control to HA or P#?

Wes

I think you have hit on a problem that are some could be creating by to much weight transferred to the front axle.

When we head out on a trip I pay attention to how the rear of the truck feels, if I can feel every bump through the seat of my pants, I know I have gone too far on the weight transfer. As soon as I adjust it back to the point that the thumping from the bumps and expansion joints disappear, I have brought it back to where it should be. It doesn't happen unless I have changed how I load the TT.