If you look at my picture link in signature and album for the 48 you can see air bags with internal bump stops added to the front between spring and frame. Also air helper springs added to the rear.
The springs I had made for my 1 ton but I moved them over to the 2 ton and added the air helpers front and rear for adjustable load capacity/ride.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-