I completed a round trip to Yellowstone from NJ driving over 4800 miles. I was very pleased with the ride with the new Kelderman rear air suspension system. I am convinced that had I not had this system, I would have suffered damage of some sort given the conditions of some of the roads we traveled on. The ride was much more enjoyable without all the severe bumps and jostling around. This system definitely settled the back end down and I could not imagine making such a long trip without it.
As a cheaper alternative to the ACE system, I would highly recommend it. My cost was:
SUSPENSION SYSTEM $1700
SHIPPING $155
INSTALLATION $750
The trip to Yellowstone was phenomenal and my kids (4) were impressed with seeing so much of the country.