Should have stopped where?
I can't see how that sentence could have possibly confused you. You should have stopped
"after the first sentence."
Go tell that to the SoS people who handed me plates for my tractors - they said in the back because they are power only units. The MSP officer who did the inspections said in the back for the same reason so when you drive or own something more than a van, tell me about it.
You're gonna hang tough and stick with that, are you? OK. I find it hard to believe that the SoS and the MSP would tell you the exact opposite of what the law is. It's not even complex and ambiguous, and open to wide interpretations like many Michigan laws are. It's very clear and precise. The law makes no exception for, or even mentions, a "power only unit", whatever that is, with regard to license plate positioning. Are you implying that you bought more than one actual truck tractor or road tractor specifically to use them as "power only units" and not ever haul a trailer of some kind with any of them? As personal touring vehicles, perhaps?
But I took your advice and talked to the SoS people who handed you your plates for your tractors (just how many tractors do you own, anyway?) and they said a truck tractor or a road tractor must have the plates on the front. They said a plate goes on the rear of a trailer being towed by a truck tractor or a road tractor, and on the front of a "power only unit" if the "power only unit" in question is a truck tractor or a road tractor. They were quite sure of this. They wondered what kind of tractors you have, since you didn't specify, and wondered what kind of tractor that's
not a truck tractor or a road tractor, which would require both a license plate and a MSP inspection. A farm tractor or some kind of other off-road tractor, maybe? They were all a twitter, though oddly enough no one Tweeted.
I don't need to own or drive something other than a van to be aware of and understand the laws governing other vehicles.
What I won't do, however, is remain ignorant of the facts, make wild guesses about them instead, and then dispense authoritatively sounding advice based on those wild guesses. And yes, I am speak for EO when I say that.