10 lug 3500HD Or a bread truck or RV P30 chassis also with 5 and 10 lug axles. They have a 7.25" bolt circle like the original AD BigBolt did.
Then you can run old 20" wheels or if you can find them 22.5". Check the pictures of my truck project with those 22.5" wheels.

One difficulty of using a later chassis is the front axle is usually much wider, be sure to use your tape measure before deciding on a chassis to use..

You'll find some more info in the disc brake sticky thread as well as in the big bolt wheels and tires tech tip.

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-