I don't have any on the rear of my extra heavy stiff sprung 1 ton, same wheel base as yours.
When I rebuild my truck into a 2 ton I will add shocks.
When empty and on a gravel road you really need them, unless you go really slow....
Grigg

•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-