I put the Kelderrman rear leveling springs on my 2500 in June 2023. I had two goals - lower the rear suspension, and soften the ride a little. The Kelderman setup delivers on both counts. The truck now sits level with about 35 psi in the springs, and the ride when unloaded is noticeably smoother - it really takes the edge off of the sharp bumps. I pull a smaller (about 5000 lb.) bumper pull TT, and I increase the pressure to about 45-50 psi when towing to maintain the level height. I am really pleased with these springs. I happen to live in Iowa, about 90 minutes from Kelderman's shop, so I drove there and had them install the springs.