Westend, I appreciate your comments. And I agree with you to the extent that electrical heating is not "generally" the best method of heating. But sometimes we just need a little heating help and it might be the ticket; so I'm conducting this experiment.
Sometimes I'm out and the the night gets exceptionally cold, but just a little boost in heat will make the environment in my coach a bit more comfortable. This is in addition to to my propane heating system. I'd be plugged into the campground electricity usually, but even if not the max current I expect to expend is 15 amps.
It's a DIY project so I don't expect to spend more than $300.00 for the heating film, thermostat, underlayment, visqueen, and overlayment. The carpet runner over the the installation constitutes part of the overlayment. The thermostat will be set only high enough to overcome the chill and far below any hazardous level.
As far as Fido's accommodations is concerned, he has a heavy wire crate the bottom of which is a solid surface which will shield the installation from chewng. And the wires running to the power source and thermostat, will be run in conduit. I hope to complete the project this weekend.