Some Bostrom airride seats have a centering device that allows you to snap a handle back and the seat will slide back and forth on the track, taking the back jarring out of the ride . Basically, when you hit a bump, the seat rolls back and forth on the track, taking backslap out of the ride. We had them in our Peterbilts. Bostrom Wideride has a damper to do the same thing. Having ridden 3 million miles on air I want the best and smoothest. How much is your back worth compared to surgery? I can tell you as I've had 2. Look at Peterbilt or Kenworth seats also, they make them too.