What I have found that eases out some of the jolt is to put plastic liners between the spring leaves. This lets the leaves glide on each other and transfers a lot of the shock to the free swinging shackles rather than into the chassis. I think polypropaline works better than teflon as teflon gets trash imbedded in it. If you never haul a load you could leave out one or two SHORT leaves since the short ones are the ones that add stiffness while the long ones do the flexing.

Evan