Ive seen Ford C900 tandems and White 3000 tandems, so go for it. I would use a walking beam suspension. If you wanted it to be period correct, you could make the rear axle a dead axle. So, single drive, tandem axles. This was the case for many tandem conversions.
P.S. Im sure somewhere in the U.S. there was a tree service, or some company with a stretched Dodge L700 with tandems and a crane. It is America, after all.