This is a good recommendation about detaching the battery in between uses. But you also have a 100 watt solar panel which can accomplish the same task without the hassle of removing the battery and putting a separate charger on it. This is assuming the camper is stored in such a way that the panel gets direct daily sunlight.
I'm not sure about advice in the flickering lights. Is this happening with the battery disconnected? "Breakers" in your OEM power center are for the 120 Volt AC system (shore power) and flipping them won't make any difference to an unplugged camper in storage.