Here is a picture of the P30 axle and wheels under a 1 ton.
The wheels and tires fit pretty good, and look good I think.
http://rides.webshots.com/photo/1484236297080251109lCqQCo
The problem comes with the axle, it is 10.25" narrower now than when it came from the P30. If I had not narrowed it the wheels would have stuck out of the fenders about 5" each side. This would be a problem with putting the old truck body on the P30 Chassis, fenders would need to be widened, is there a clean way to do that??

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-