Unless it was a special order truck, it's a 1-1/2 ton Single Wheel truck (has too many rear springs to be a 1/2 ton)...Chevrolet didn't make a 3/4 or 1-ton truck back then.
What's the model designation on the data plate?
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD