As far as I know (which is not very well) each can be had in two if not more different widths.
Just take a tape measure with you on your searches.

A 3500HD with the 70HD or 80 is pretty narrow.
Many P30 chassis with a 70HD are narrow.
I expect some P30 chassis with 70HD or 80 are wide, look for one with tires out to about the edge of the body.


•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-