Bill, among your many talents and experiences, I don't believe you ever drove a semi-truck, over the road. I have.
In fact, I'm pretty certain my Class A CDL certifies me by every state in the union to drive a commercial vehicle in every single one. Since you don't know what I mean about "minimum dimensions", I will clarify that. I will confess, that my statement would seem rather confusing to anyone not fully in sync with what I was thinking about. Sorry 'bout that.
Once upon a time, different states had wildly different maximum length and gross vehicle weights for trucks. The Feds came in and effectively said to each state, "These are the smallest maximum weights (and length) we will allow you to set for travel on roads we are subsidizing". Hence, a minimum permitted maximum GVR & length for each state to limit truck sizes to.
During the early 80's and prior, three states were obstructing efficient cross-county travel for the whole USA! Illinois, Missouri, and Arkansas were united in an evil plot to make tons of money by fining trucks for exceeding the maximum length and weights allowed by nearly all the other states. A 65 foot long truck could be loaded up with 80,000 pounds of lumber in Oregon, and travel legally until it came to Illinois. Then it got pulled over at a scale house coming into the state, and would be issued a giant fine for exceeding 73,280 pounds and would have to pay some other trucking company to have part of the load removed so as to allow it to proceed. It would also get a hefty fine for driving over-length in that state. It was a racket, and those three states created a vertical barrier across nearly the whole country for any trucking between the two coasts. Obviously, you could go south of Arkansas to go under the legal trap, but that wasn't efficient, either.
Along came Ronald Reagan and his deregulation changes, and the Feds imposed new "minimum" maximums on all the states in 1982, and you could go clear across the country, knowing that you wouldn't get trapped in some state. I haven't checked recently, but it seems to me that Wyoming has an upper weight limit of more than 80,000lbs, and Michigan is still crazy heavy at 164,000 lbs. That is a "grandfathered" law, but such weights can only be reached by adding more axles to a truck, and limited to 11 axles.