Following an email from 9Dave, I decided to implement an alternate route from Canaan, VT to Eustis, ME. Portions of the original route go through the Dartmouth College Grant. The grant was given to the college by the king of England before the United States existed, and is maintained as a private preserve for the students and alumni. It is often gated, and is an area where one is likely to be hassled or at least questioned.
The route attached substitutes some pavement for gravel. The pavement sections are among the most scenic in New England, so I feel this is a fair trade-off. The ride through Dixville Notch is a hoot, and the ride up the Magalloway River is a scenic mix of twisties. Dual-sport suspension can be a plus here, as some of the pavement is rough enough to have one wishing for a return to gravel.
See full file for leg 2 in post #10.