All those appliances run on propane for the main 'heating' element. But, they also need basic 12v power to run the circuit board that controls them.
In the case of the furnance, the fan or blower will use 12v power to run and that will drain the 12v system pretty fast if you don't have a way to recharge the batteries.
I didn't look at your U tube link, but I assume you are renting a class C or class A motorhome? If that's the case, they will usually have a built in gas powered generator that will provide 120v power. But, when renting, they charge EXTRA for generator hour use, so it's up to you how much you run them.. ;)
When you are camping with no hookups, you can't just use power, water and sewer like you were at home, so there has to be some changes made to your routine.
If you stay at full hook up sites, and know how your hookups work, you can waste all the resources you want! :)
You'll get a full lesson from the rental place on the utilities of the RV, but it'll still be a learning experience to go thru if you've never used them before and once you do, that's when you'll figure things out.. Maybe too late, but you'll figure it out one way or the other! ;)
Good luck!
Mitch
