I just purchased a 1996 FL70, Cummins 8.3C, 9 speed Eaton/Fuller 8709, 225" WB, 21K rockwell 3.58 rear, factory air rear, 12K front spring suspension, air ride cab, air ride seats. It still rides like a truck! My dual 75 gal fuel tanks get in the way of a Mor/Ryde, and Brock's add a ride. It has a 72" AA sleeper, 11' gooseneck flatbed. It rides okay on the highway, rough on these country roads out here. I am thinking to start with monroe gas magnum shocks and look at replacing the front springs with some lighter springs. Any ideas? Thanks for your help.