How do you get your coach ready for freezing weather?

[Jipjob]

Well its suppose to drop down into the 20's this weekend with highs in the low
30's. I do not want my coach to freeze up-what would be the simplest solution?
I really do not want to blow down the system but if I haft to I will. I have a
space heater in the area where the pipes runs back and fort and think I might
just fire up the propane heaters in the old rig-do you think that will keep the
pipes from freezing????