You will most likely have to buy either special wheels from a wheel manufacturer like Stockton Wheel (I don't recomend the company).
Or buy some wheel adaptors and then buy some wide singles often called super singels or wide base wheels for semi sized trucks.
Just my 1.5 cents.

•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-