Route for Rutland, VT to Fryeburg, ME in big rig

From what I can see and know (which is somewhat incomplete), that looks like a perfectly reasonable route.

Another not unreasonable option would be to take 4 over to 91N and take NH 112 (the Kanc) over. It looks to be about the same distance and time, though the Kancamagus in practice would likely make it a bit slower, particularly this time of year with all the leaf peepers. It is a beautiful drive, though.