I had the super springs installed in while we were in Elkhart last October on our way south for the winter, can't remember the name of the place without pulling the paper work but it was right down the street from Heartland factory. The owner of the place guaranteed me that if I didn't like them he would give me my money back. He sold both air bags and the super springs and his recomendation was the super springs. He said all the RV hawlers are useing them. I do like them, it did seem to raise my truck up a little though. I will not be asking for my money back. Took them a little over an hour to do and we waited in there waiting room me the wife and our 2 labradors, very pleasant experiance.