Heyas!
Welcome to the 'Bolt!
That is a neat truck, if you find any numbers on the badges on the sides of the truck, let us know - someone somewhere on here can break it down for you.
Also, you can poke around in the gallery and see other type trucks, that should give you an idea.
http://www.stovebolt.com/gallery47-55.htm With those dual wheels I'm guessing it is at least a 1 ton...
-W