Fridge gets cleaned out, turned off, and doors wide open. Its a good time to go through and throw away stuff thats been in there too long.
I also winterize the plumbing, I installed a pump, valves, hot water heater crossover, just like whats in the trailer. I pump RV antifreeze, open one faucet at a time and let some run into the traps. Not to forget the washing machine, and undo and drain the ice maker line.
Then for an extra measure, I throw a handfull of rock salt in all the drains. Heat is turned off completly.
I used to leave the heat on around 50, but every year I lost power while I was away, and had numerous broken pipes when I got back. That wont happen any more, and I don't have to pay for the heat.