Spanky,
Is this the original type bed for AD trucks?
http://rides.webshots.com/photo/2403357160080251109EpvEwY from a 53 GMC, looks original to the truck but not sure if it was installed by GM or aftermarket.

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-