That truck is the same as my 56 GMC a 1.5 ton it has the small 10 lug 6 1/4" hub piloted bolt pattern 22.5 wheels. The 2 ton will have 6 lug stud piloted wheels with the much bigger 8 3/4" pattern that truck with the dump box should weigh about 8,000 pounds and have a GVW of 14,000 and a GCVW of 22,000.
I also notice that it is a V8 truck should have the a Buick Nail Head in it where is my GMC has a 317 Pontiac.