Does anybody know what the spring rate is on Skyjacker D25 coil springs ? From what I'm hearing that the D25 have less spring pressure then stock. They give you a better ride but they start sagging in about 18 months on the 2003's. I'm thinking of getting some customs with 2" lift made with a little more spring pressure then stock. Stock are supposed to be around 460-480 lbs for spring rate. Thanks guys.