i would just unload the weapon before getting into the vehicle, and relaod when you get out to be safe, and a few places to NOT carry openly!.
Portland WILL disarm you, no questions asked, they are dicks!
Auburn/lewiston is just about the same as portland.
Biddeford is liabale to shoot you for OC, they dont even know its legal in biddo, i got taken down at gunpoint and had my weapon seased, searched, detained, brought to county jail........just dont OC in biddo lol
other than that have fun :-D if you look at my older posts, i've taked to saco PD chief and deputy chief, all the sergants, saco is OC friendly if you head this way :-D