Since this is Sunday and you may not have access to a thermostat or you do not do your mechanical work (I don't). Got to Walmart, Lowe's or Home Depot and get some small electrical heaters to heat just the room you are in. Also, get an electric blanket or two to help you keep warm while sleeping or sitting in the 5th wheel watching TV.
I have a couple of the 12v throws in the RV so we can use them with the battery and not turn on the generator if we are traveling.
Good luck. Hope you are able to get something today. If not the above, then maybe thermal long johns or sweats or both.