Was a 1 ton model made in early 1928? If so, what is the difference between it and a 1 1/2 ton? Was it just dual wheels and heavier springs or what? I have tried to reference the 1928 AAs and just can't turn up that much. Also, would the clutch be multi-disc and would the 2-speed differential be within the rearaxle like a Ruckstell or a transaxle? Thanks-a-lot! Saltman