Yes, on these trailers all axles are dualed. We used to have some tankers that ran "super singles" (Or boloneys if you prefer) on the air axles.
All I can tell you about the number of axles and the configurations of the axles has something to do with the Michigan weight law..
I'm no expert on it, and I'm sure I'll be corrected.. but, with a semi and tri-axle (which the ones I grew up around were 9 foot spreads..) was good for 100k legally.
I do know there is a bridge law, as there is in a lot of states, and the "bridging", or spacing of axles has something to do with the weight that can be legally hauled.. But basically, there are 7 (plus the 3 on the tractor) axles so the tractor and trailer can gross 160,000 pounds legally.
Seems to me that the rear axle of the tractor and the front axle of the trailer must be 12 feet apart (not sure.. but that comes to mind..) and that would be your bridge (I think) and I know we can't have more than 11 axles hitting the road at a time..
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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