Most modern RVs with 3 stage power converters the converter is parallel with the battery however there is a Battery disconnect, usually just inside the door (So you can reach it when standing on dirt) it may be marked ON/OFF. Connect/Disconnect or Use/Store.
Mine the switch failed, it would Store just fine but it would not USE (Connect) I fixed it by cleaning, ask if you need to know how to do that, it is easy, no tools or materials needed save fingers. And perhaps a key.
Some Older RVs may be "Blessed" (Or is that cursed) with something like the Magnetek 6300.. This device has two 12 volt circuits. one is connected to the battery direct (it powers things like radios and the winegard antenna) the other is powered by a 12 volt unfiltered supply when plugged in (lights, water pump and the like) and a relay that connects the two together when you unplug. This relay, like my switch, can fail.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times