Replying to Sleeping in vehicle in VT

Anyone here slept in their car in VT or NH in the winter? I've comfortably slept in vehicles before in cooler temperatures but not New England winter kind of cold. My thinking is to head up on weekends when conditions are good and sleep in the car so that I can maximize skiing and sleep, while minimizing cost and driving hours per day. I'm mostly interested in this for the area around Jay Peak but if I get good at it I may be start doing it other places too.


How would a poor skier best: 1. stay warm, 2. stay comfortable, 3. avoid getting hassled?

Best cold weather sleeping bags?
Places to legally park overnight?


Thoughts and recommendations appreciated

cheers!