Originally Posted by 73shark
"If I am interpreting the title correctly, the spring assist kit is mainly to handle extra load. The Koni shocks should reduce sway and bouncing. An air ride suspension system should reduce the rear seat ride problem. Stiffer front and rear roll bars should reduce body roll.
Adding this question on to the end of a 5 page string about Suspension Upgrades for the Interstate. I've got a 2016 GT -- have thought about all the things folks have done (read through the entire thread) -- but that was all back some years ago. Now Agile Off Road is offering a spring and shock-absorber upgrade ("RIP" - Ride Improvement Package) specifically for the Interstate 3500. Pricey, but I think they have covered all the bases if one does not go for the Air Ride Interstate package. So, I am wondering if anyone has had this install done? Agile says they have done numerous Interstates. Would welcome comments from anyone who has gone with this solution.... here's the link.