Looks like you have the medium size 10 lug wheels. Not semi truck size, and not AD Chevy size.

One of those pictures of the rear rim looks like a true "split rim", the kind to stay away from.
Some of the others look like the 3 piece lock ring type, and are serviceable if in good condition.

Look in this wheel catalog: http://www.accuridewheels.com/completeversion.pdf
on page number 12 and see if that is the bolt pattern you have, 10 hole 8.75 circle diameter?
If so then you could buy new 22.5" wheels, Accuride part number 28160.

If the 22.5" wheels fit that's what I would do if the truck were mine, probably run 9R22.5 or 10R22.5 tires, depending on fender clearance.

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-