True, up thru at least 1949 (couldn't find wheel info in the 1950 Vehicle Info Kit), base wheels were 4" wide for 1/2 tons. But the 1951 Vehicle Info Kit definitely says 4-1/2 inch width.
4-1/2 inch width wheels were an option on the earlier trucks.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.