Air suspension for a 95 3/4 ton Chevy van?

[Bogie]

I've been considering adding an air suspension under the rear end of the Battlecruiser... It's mostly used for dragging the trailer, and since it's a Chevy, it rides a little low in the rear anyway... Any thoughts/suggestions?
 
http://www.truckspring.com/air-lift_12.html

http://www.truckspring.com/air-spring-kits_256.html

[erik the bold]

While I've had very good results with Firestone air bags in industrial applications, why not just add a set of air shocks?  A set of Monroe's are about $150.  Similar result and $130 less expensive.