Make sure that your furnace is working well. You can use space heaters but keep them to the low setting (like 750 watts) or you may trip your breaker. Using my furnace, I stay toasty warm.
If the nights get very cold and day time highs are going to be in the 30's, you should fill your fresh water tanks and not use the city water inlet (drain your water hose). Also do not leave your valves, to black/grey tanks open. Let your grey/black tanks fill and you can dump them in the warmest part of the day- if possible. If you leave them open- especially black- you can get some nasty stuff freezing to the tank or the valves.
Are your bays heated or are your tanks heated? This is the time to find out, if you do not know. In frigid temps you might need a little extra help, for your tanks. Some folks use a drop light, in their bay by the tanks. Adds about 10 degrees of extra heat. I've never been out in my coach, with temps that bad (only 25 for low/ 40 high) so have never needed more than my heated bays to keep tanks safe.
Should it also get very cold, you should crack the cabinets where your water lines are so that they get extra heat as most of them will be along the outside wall of the coach.
This time of year, generally, it's not frigid- in VA- but it is always better to be prepared, for the worst, so that you are ready if it happens.
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Have a wonderful holiday!!