If the wheels are any indication, being 7 holes, and they haven't been changed out, they tell me that this is a 1.5 ton, of coarse, I'm not completely in the know about the earlier design series, so, I may be way off base here.
Jeff
The rims on a 41-46 chevy 1.5 ton actually has 5 hand holes, not 7. I had to search through alot of info on the wheels for this model, I needed 1 more for my 41 1.5 ton. I think that the larger GMCs had wheels like yours, but I don't know much about the 2 ton chevs, I thought they would be the same as the 1.5 ton. What size are you tires?