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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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