There is a lot to learn for a new rver. This is a great place to learn. It is important to disconnect the rv battery when not in use because as suggested there are small drains such as the propane detector.
Seems any new vehicles have computers of some sort and draw a tiny bit of power even when shut off. To make disconnecting batteries on the toys you can buy some heavy duty connectors at your local parts store.
Installing an small solar panel for the rv batteries is a great idea in any case. The batteries will be ready to go when you are.
