About 8 months ago I noticed the front end on my 2000 3500 dually was sagging, to the point that my front tires was cupping. The truck was out of warranty, so I took it to a local suspension shop specializing in heavy duty trucks. They sold my a set of "cargo springs" and said these would solve the problem. They also said that alot of Dodge Cummins owners come in with the same problem. Although the springs are physically taller, heavier and thicker, they only temp. fixed the problem. After only about 3 months since the new springs was installed the front end is sagging again. Besides the cupping of the tires, the truck doesn't look as good with the front sitting so low. Has anyone else experience this problem and how did you fix it. Any info. would be greatly appreciated.