Based on the reports he began in Silver City MA, drove for around 5 hours (at least) to end up at the street he was on when he stopped for gas and money, that is a fact.
Then from there he had an additional 40 minutes of driving to the Rio Arriba Commons of which we are unsure on where he could have disappeared. I am going to work off of the fastest suggested route on Google Maps, as the only route that made sense spent most of the time on the highway with little variation between routes.
A few casinos on the way which I felt may have been of interest, considering strange charges on his card being present, then a few diners and the like on the way- maybe he stopped to pick up some snacks for when he came home to his kids? Just a theory- obviously, something parents often do after long trips. Only one river he went anywhere near, the Rio Grande river, passing over one of two bridges that I can see, and by then he was barely a few minutes from his destination. I saw no canyons or other dangerous places in my once over, though I may have missed something.
I am going to see what more I can find out... I hope he can return to his kids safely...