How about this, GMC and Chevrolet both built a 1 1/2 ton truck from 1960-1972 that used the standard light truck sheetmetal, as well as a beefed up version fo the 1 ton ifs. I don't know how common they were, as it seems that they built 1 1/2 tons in some of those years with the Big Bolt sheetmetal and I beam axle, too. I've seen a few, they're kind of neat as they look like a regular C30 duallie with a long wheelbase at first, but then you notice the odd bolt pattern and size of the wheels.
