I have live in my trailer in North Dakota for 3 years now, and it can be rough. It would actually be kinda easy if you were not going to use your plumbing or holding tanks. I skirted with 1 inch foam, put the plastic on my windows to imitate dual pane, and that is about it. Fortunately, I have 90 amps available, so I only run propane when the power is out, or to warm it up faster. I use 2 ceramic heaters under the trailer,and that would keep it above freezing when 28 below. It could be freezing or colder on the dirt, but if your skirting is tight enough, the heat will rise up to the underbelly and keep you warm inside. I use 3 ceramic heaters inside, bedroom, bathroom, and living area. Propane would have no problem keeping you warm at night, and you would definitely not use more than 100 lbs. in a week, unless you tried to maintain 95 degrees inside.