Well I purchased a set a rear Timbrens for my truck. After one week of testing, I decided to return them, here is why. Extremely easy install, that's a given. They absolutely minimized the rock...
I emailed Timbren over the weekend and received pretty much the same reply. Use the HD model for a truck that carries a camper. I take my camper off and was worried when only towing my 16' aluminum trailer with ATV's or snowmobiles it would get bouncy, but they said the HD's are shorter and would not even hit the springs with that size load.