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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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