Alternative to the R4tech package here:
Dealer_E-Mail_Ad_120409

http://www.airbagit.com/product-p/towing-f350.htm


One thing though, after having adjustable rear suspension in my previous vehicle, a Mercedes. It was more like the R4tech system in that it used soft springs with pumped lift assist. Once the lift assist failed, but the soft spring had enough lift for me to make the long drive home. When I pulled the system apart I found a leaking union, so it was a no-cost repair to get it going again. If you get a pressure leak on the airbagit system you'll be on the bump stops all the way home - that'd be BAD!