Fred,
Being a resident Maineiac, I took a look at your plans for travel thru Maine. It looks pretty good to me. No big holes for sure, other than a few pot holes, perhaps. You probably already know this but NH 16 north of Berlin and Errol is an interesting ride to get to Rangeley, continue north out of Errol to Wilsons Mills, ME and over to Oquossoc. Lots of moose up that way and very remote. A nice stop along that road is Aziscohos Lake. No, I can't pronounce it. When you get to Oquossoc, do yourself a favor and go to Height Of Land, A 30-40 minute side trip. Take a fast right at the end of 16 and then a faster left onto 17, it's the scenic turnout at the top of the mountain, an awesome view. Not sure if it's marked but you'll know when you get there. Then turn around and a few miles back on the right is the Rangeley Lake overview. From there, you're only about 20 minutes from Rangeley. From Rangeley, I would take 16 over to Stratton. That whole area is loaded with moose. Then down past Sugarloaf Ski Area to Kingfield. A 5 minute ride to the ski area is worth it. I would then take 16 to North Anson, Bingham, up to Abbot, then Dover-Foxcroft, Milo, and RT6 to continue as planned. The ride home looks good to me. See ya there.