The NV4500 in some 2wd drive applications was available with a tail shaft mounted parking brake. That would be exactly what you want. Some UPS trucks had them, but good luck finding a UPS truck. You may find other step vans that do though.

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-