I heard my name! In the last 58 years your trucks could have had many parts swapped around so there's no real way to tell exactly what you have. If it has a single speed rear it's more than likely a 1 1/2 ton. Most 2 tons had the 2 speed rears. Most 1 1/2 tons started out with 7.50 x 20' tires on them with about a 5' wide rim. 8.25 x 20's x a 6" rim for the 2 tons. The term "Loadmaster" also usually indicated a 1 1/2 ton. I'm not an expert on this since I've never had a 2 ton so some of this info mat be flawed.
To find out what engine you have, find a flat spot on your block just above and in front of your starter. Clean this area well with a wire brush and list those numbers on this post and we'll try to decipher them for you.
Post some pictures of them for us so we can see what we're talking about. Welcome to the Stovebolt,
Scott
