We were there last year during the debacle. It was colder!
You are good to go. Do what you said.
We did not leave faucets on, unnecessary. Sewer drain valves closed. Tank heaters on.
Make sure there is no water in the sewer. Lift it near the rv and make sure it is empty.
Use the fireplace. Set the furnace to run. You need it to keep the pipes warm. Do not run three space heaters. Only the fireplace. We set our furnace at 65. Fireplace at 70.