The '41 is somewhat of an odd case, though, as the 1 ton truck (According to my sources, only a Panel was offered) was based on the 1 1/2 ton chassis, with lighter spring and tire equipment.
Then again, if you go later, there was a 1 1/2 ton offered in the late '60s/early '70s that used the same body as the 1/2 through 1 ton trucks, with the difference being an HD suspension, larger brakes, HD rear axle, and heavier tires.
To muddy the waters even more, there was also a 1 1/2 ton Express model (a very large pickup) offered during the '30s.
In the case of the '52, the fenders are the same through 1 ton.
