To get from Fredericksburg to Richmond or vice versa, you have at least 60 miles of charge in your tank or you were never going to make it. At highway speeds, that's at least 20 kWh of battery power. It won't take more than 300-500 watts to heat the cabin continuously even in the middle of a blizzard. That means your battery will last 44 to 66 hours at minimum. So you've got multiple days of heat, water is falling from the sky, and the bathroom is immediately outside your doors.

This is one of the nice things about electric cars: the motor uses no energy while idling, and moving the car requires so much energy that you'll never run out if you're stationary. Most new EVs today have 60-80 kWh batteries. It would take several weeks to drain a full battery just running A/C or heat along with the radio and screens.