Correct, found on GM and Ford step vans, 4x4 trucks, and any other 3/4 or 1 ton you're lucky enough to find them on. Certainly not found on all of those possibilities though, also by chance.

•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-