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Ive had 94,01,03 Cummins.Ive tried every spring on almost all of them and all sorts of variations of lifts,spacers as well as shocks.Ive tried progressive Top Gun,Rough Country,superlift,D25's you name it.I have a Bodiak hitch on the front and carrry a small Honda 70 on the front,we also have a 4,000 big foot camper and tow a 4,000 boat.Im finally found a spring that lifts as well as helps weight carrying.Tuftruck 5000lb with 2.5" lift are amazing on our 4dr dually,the truck rides far better loaded and unloaded.They make 2 different version a 2600 and 5000 both available in stock and lifted.I run silver Bilstien's and use Timbrens.I highly reccomend the Timbrens if you tow alot of weight,gets rid of the pogo effect and side to side of the air bags.Im not a dealer or have anything to do with these companys.Ive just spent so much money and time redoing the front with all these different set ups and always being dissapointed,I figured maybe this will save someone else heartache down the raod.Again TUFTRUCK springs 2 thumbs up