Our slides and hydraulic levelers are powered from the single chassis battery. Coming from fifth wheel and TT campers, we were surprised to find that out. Oh, and we figured that out the hard way. The single coach battery on our last 5'er handled the super slide quite well.
I would prefer to have the slides and levelers powered from the chassis battery. If I need to run the slide out for any reason I have to run into the house to get the keys and start the MH up just to run the slide out. It would be much simpler if I could just turn the coach batteries on and plug it up to shore power.