#1 Did you stay warm by typing a book? ( I'm kidding )
#2 Did you stay warm by stripping the interior? ( again kidding )
#3 Could you post pictures of your pipe warmers? ( not kidding )
#4 How did you deal with waste dumping, and avoiding poopcicle?
#5 How did you deal with fresh water supply not freezing?
#6 How to you deal with condensation inside the trailer?
I think you made a good move by using electric heat. My thinking is that electric heat doesn't need to suck cold air from every crack to replace the air that is exhausted by a furnace.