Do they allow overnight parking in their parking lot at Cracker Barrel

Yes they do i used to work for them

I don't know but more than likely a cop might come to your door wondering why your in a business parking lot while the place is closed

Yes, with the following rules. Call before going there so management knows you'll be overnighting. No using generators as the back parking lot faces a near by Hotel. You have to come in for a meal, I suggest breakfast to start your day. You have to leave during the day, there's a Home Depot parking lot across the street.

Yes

Since their back lot shares with the Best Western I'd check with the management.

I am not sure.

My understanding is yes they do!