I really like the transmission mounted parking brake that someone swapped into my 52 1 ton.
It holds really really well on any incline, no hesitation. I found it usable as an emergency brake with no problems, just takes a light application to slow down a lot.

I don't know about the wheel mounted parking brake, with a transmission mounted one that works so well I'll never bother to find out either...

Yes jacking a rear wheel up renders the driveline brake useless, but when (if ever) do you absolutely have to change a wheel on hill, and why can't you use wheel chocks like you know you should no matter what brake you have?

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-