Hi Debra, and welcome!
I have a 2351, basically the same coach, just a foot longer.
I weathered several nights in the 20s before coming south, and here are the things that helped me get through:
-- I set my furnace thermostat to 65, though I know many people set theirs as low as 50.
-- Leave the bathroom cabinet open and the bathroom door cracked so that the furnace will heat the pipes leading to your outside shower, which is definitely a vulnerable point.
-- Crack open your kitchen sink cabinet so that heat can filter back to those pipes, too.
-- Anytime it is going to be 32 or below, be sure your water heater is on.
-- Be sure there is at least a few gallons in your gray and black tanks, and if you have the heating pads, turn them on. If you don't have heating pads, pour some antifreeze down there.
-- If you have a macerator, put some antifreeze in the gray tank then run the macerator just a little bit to get some of the antifreeze mixture in there.
That's all I can think of off the top of my head, but I'm sure others can offer more. It's a start. Good luck!