Like I said before, I'd forget Forcier. Everyone who lives in the area had nice things to say about him. Would he really have picked Maura up just to drive her 100 feet down the road to his trailer? No. Also, his trailer was later searched by police after he sold it.
I firmly believe the most likely scenario is that Maura had planned to meet someone up in NH all along and that person contributed (directly, or indirectly) to her death. The key to her disappearance is finding out who she planned to meet.
Anyway, here's a music video from Forcier. Just another example of the strange and cool characters you're likely to meet in the North Country.