Shocks, were indeed, a seldom used option, on Advance Design/New Design G.M. Trucks. Out of all the 2 ton '47-'55 trucks, I've had. Only one of them had Factory Shocks. I've got a 1951 Chevrolet Truck filmstrip, that shows, these shocks.
Spanky Hardy Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers