Thanks CamperPaul for the clarification. I saw a similar episode where they used hot water rather then electric. But I wondered if the OP was intending to use tank heaters or ???, not sure what that blanket might be. And I'm not the expert, but it seems to me the hot water solution might be better. You could make hot water with electric or propane or both, using your current water heater or a 2nd one. I think I saw a past post on that topic.
That ceramic tile reminds me of Lucy collecting rocks in the movie "The Long Long Trailer". Square rocks weigh about the same as round rocks and your brakes don't know the difference :D