If you already plan to or wanted an excuse to change wheels then I recommend the 19.5 wheels, you can even find some that work with the original hub caps.

If you don't want to change wheels, it's not necessary anyway, then just buy some new tires and tubes and continue on as you are now.
I ran my 1 ton for several years with absolutely no problems from the original wheels and 7.50-17 tires.

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-