Those tubeless 10 lug on 7.25" wheels actually came with 8x22.5 or even 7x22.5 tires. These sizes likely aren't available any more, I haven't seen theme except old crispy tires on these wheels.
The available replacement is a 9R22.5 tire, which should be used on 6" wide rim minimum. The old wheels are only 5.25" wide, the 9R22.5 tires do still easily fit and in many cases will work fine, but not advised by the tire manufacturer.

•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-