Update on my triple towing.
I shorten my boat tongue by 3 feet, move boat forward on trailer 6 inches, removed my drop hitch receiver on motorhome and my total length from boat motor to front of motorhome is 70 foot right on the head, exact not a inch over, I am now legal in Nevada, Idaho, Montana, Wyoming, South Dakota, North Dakota and Colorado, and all these states connect together with Nevada.
7 states I can travel with my boat/truck behind motorhome.
I also have a 2nd camera now on the truck to watch the boat from the motorhome.
As to law about the middle being a 5th wheel go look at link and see what it reads, no requirement in these 7 states.
Here is the link to all state laws on triple towing, see you on the road..
https://www.rvia.org/system/files/media/file/Maximum%20RV%20Length.pdf:B:C:B