Four-link rear air suspension

[Archive]

Ridetech.com sells a 4-link rear air ride suspension. They also sell front air ride suspensions for IFS. I don't know how strong the components are, however ($1600). Fontaine sells a complete 4-link air ride suspension for the Ford F-450 & F-550. I have all the literature, and it is a very heavy-duty setup. The only problem is that it's over $3000. It looks just like what comes on Class 8 tractors. What I would like to know is if anyone has converted to a 4-link rear air ride suspension, and how well they like the ride. Does anyone know of other companies that make a 4-link rear air ride suspension? Thanks for any information.