My truck has been worked pretty hard, and porpoises badly. I think the suspension is sagging and the PO installed spacers in the coils (the wedge kind) I was planning to replace with the Moog Heavy duty springs as this is a working truck. Any comments on effects of these springs, ride, handling, to harsh etc? I just ordered Monroe Magnums for the beast. EDIT: More thoughts on this...door jamb says tires should be 225's, rig is fitted w/ 235's. PO thought van rode low so added the "jam in " spacer. It wasnt riding low just too big a tire. Suspension may not be sagged after all. I'm thinking put on 225's, the shocks I ordered and remove spacer. That spacer could be contributing to the lousy handling.