I did encounter a supercharger that was down in Salt Lake at 1 am. There is a service center 1 mile away with destination chargers, and another supercharger about 20 miles away. So worst case, charge on destination charger for 45 min then drive 20 miles to another supercharger. Since my house is 25 miles away and I still had some charge left, and a there were other, more convenient L2 options on the way home I opted for L2 charger down the road.