I've found out from experience that the "Heavy Duty" shocks do very little for the ride characterics of a truck, unless you're loaded. The best shock I've ever used on the rear, were Rancho's. They didn't seem to do much when riding around town, but when crossing a railroad or a big whoopty-do in the road, wow, what a difference.
From what I understand, the biggest thing that shocks do is dampen the effect of the spring. They help with the parasitic bounce of the wheel when going down the road. It's especially important when braking. If you've ever experienced wheel hop when slamming on the brakes, you'll know why it's important.
Chris
Last edited by Whitedog; 05/19/2012 3:43 PM.