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As far as figuring out whether it's a 1/2 ton or 3/4 ton, you can check the GM Heritage site for specific info.
According to this 48 Chevy Truck Info wheelbase on a 1/2 ton would be 116 inches, and a 3/4 ton would be longer.


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.