Shoot!!...gettin COLD tomorrow night!...got to winterize!

The easiest way to combat cold in your situation is to go to Lowes or Home Depot, get some foam board insulation 1" thick. Then cut a box out of it that goes from the ground up to the bottom of the trailer making sure the outlets and line are inside the box. The heat from the ground and the trailer will protect the lines for a week or two of 20 degree weather. Nice thing is you can use this so you don't need to run antifreeze until you put the unit away - some time in November, huh? I use this trick even though I full time. We stayed in some 0 to 10 degree weather for a month and it kept me from having to move to warmer climes until we wanted to. I measured the temp inside the box at 10 degrees outside and it stayed at 50. Granted the trailer was heated to 70 inside so the carry over to the inside of the box kept it warm but you will get enough form the earth to keep above freezing.