the answer, as above, No .. yes
BUT WHY ?
do you have super duper batteries that won't self discharge ?
do you have flawless 120vac that will never fail ?
if the batteries are disconnected, and the power fails. the fridge will turn off
it will NOT even switch to LP, because unless you have a very old camper
the fridge has controls that use 12v
and if you do have a very old camper and fridge, then everything is manual not automatic
same thing for your heater/furnace, you need 12v
the only time my batteries get disconnected is during service
never disconnect batteries while using the RV
you can disconnect while in storage