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...
My truck acts as a unofficial test bed for products it seems. I have air bags, Timbrens, Rancho 9000, and alum. bump stop extenders (spring slippers). Soon to have Delrin bumps on the lowest spring leaf. It rides like a truck but carries 5K well. Oh yeah, it also has training wheels.