I don't know if the posts were saved in the truck camper university section of the forum, or maybe somewhere in the tow vehicles section, but there was a member of the forum here who built his own air ride suspension on his pickup and there was quite a discussion about it.  He built it for both the front and the rear.  I think there was also a big revision he did to one end of the truck later on, or maybe he did it to a another truck after the first one, I can't remember.  Anyways, there was much discussion on the forum about it.  Sorry I can't remember the member's name.