I was told this is a good solution for pulling heavy loads and reducing rear end sagging, where as airbags have a 1000 lb capacity this has a 8600 lb capacity. Basically you removed the factory bump stump (which gives 4-6 inches of play) and replace with the timbren kit which only gives 1/2 inch of play. My main concern is that it will give a rough ride but the maufacturer says it wont be effected at all.
http://www.truckspring.com/timbren_285.html
Any thoughts?