In this video you will see what we used for heat. Mr. Heater attachments are great, we evn cook with it if we have too, heat and boil water for coffee. We had a seven day blackout last year and this set up is what saved us from ruin. They cost about forty five dollars from most hardware stores.YouTube - 1970 Airstream in Winter storm
Mind you YOU MUSTunder skirt that trailer...Bales of hay is kind of dangerous...but you want mostly to block the wind from going under neath. Your central heat is going to EAT YOU UP! Just get a tank with a Mr. Heater and set it on the corner by the front door...and position it in just the right way that you know it is not going to roast a wall. Because it does not take long at all to heat the house with it, you can roast hotdogs etc and boil water if you are carful using the right cooking stuff.