I can go from MT to ID or WY with a double RV tow, but I can not go from ID to WA or OR.
I'm not sure about ND or SD ( I very seldom go there).
But then, I don't double tow. I was going to once, but I was advised by a CHP in Arroyo Grande (or was it Oceano? whatever) that I would have to have a Class A CDL with doubles Endorsement, so we made other arrangements. Later, I was told that no CHP officer would have/could have told me that, so I must have been dreaming or it was my imagination, or I was a liar, it could not have happened the way I remember it.
At this time, it really doesn't matter, and I really don't care.