Pictures would help. For 1938 the 1 ton shared chassis and driveline with 1 1/2 ton. The one ton had single rear wheels. They also made the 1 1/2 ton in a single wheel version. 1 ton and various configureations of the 1 1/2 ton all used 20" wheels. How much of this applies to 1936 I couldn't say. For dual wheels your studs would have to be long enough for both wheels and clamp ring plus lug nut.