morton, I would be apt to believe it is either a 1 1/2 or 2 ton truck. The vin and the GVW will provide the answers you are looking for. You say you may be "aquiring" the truck which was your grandfathers. That makes me wonder what type of price info you are looking for. Are you wondering what it's worth or are you wondering what it will cost to restore/repair it? I have a '48 Loadmaster and was in about the same situation with mine. You can see mine in the "My junk" link below, and also in the "Gallery".