On the way to work today I drove by the rest area in Chelmsford Ma (495 North), and lo and behold, I saw someone with the popup setup in the parking lot. Overnighting I guess? It was a weird place to setup, as they did it in the car parking. They backed it into an angled parking spot (One way parking, so they backed it in the wrong way). I have no idea on my state's rules on overnights, but I didn't think it was allowed in Mass.