I've found several with low miles and in great shape.
The Dana 70hd and Dana 80 with 10 lug on 7.25" circle were also used in RV's and step vans. Seems many RV's don't accumulate miles like a 3500hd truck might.

•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-