I have a 2008 Ram 2500 CTD with 103K miles. When I first put on the Timbrens I loved them. I had almost an inch between the Timbrens and the axle. Fast forward a few years and I just changed the Timbrens out for Firestone Ride Rite air bags. Once the suspension got down to where there was about a half inch of clearance from the Timbrens to the axle, the truck was riding rough as even relatively small bumps unloaded would engage the Timbrens harshly. I think the Timbrens work well when a truck is fairly new. Once the suspension has sagged a little after many miles, I think air bags are better because the Timbrens don't have enough clearance. At least that's how it worked on my truck. Love the air bags. Good luck.