Ok, Many RVs the house converter or charger also charges the chassis battery.. Same as the Engine alternator charges both chassis and house via the isolator.
However MANY =NOT= ALL. yours may be one of the "Rest" as it were
IF you are supposed to have a bi-Directional isolator.. IT's not working
IF you do not.. Trick-L-Start
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