For some reason the converter is not charging the batteries. Is the switch behind the sofa in the store position?
Check the breakers inside the trailer to see if one is tripped or turned off.
If no breaker is off, then check to see if the converter is plugged in.
If it's plugged in, check the exterior fuses on the converter. (two of them)
If the fuses on the converter are good, check the output at the converter.
If the converter is providing power and the connections to the converter are tight, check the connections to the battery.
Also check the breakers in the 12 volt
panel. If one of the small black buttons is out further than the rest, push it in to reset it.
In my Excella, some of the breakers in the battery cables are mounted on the wall near the converter, not inside a panel. I can only see those by looking under the sofa with a flashlight.
ps: switch your fridge to 120v if you have not already. It will not work on propane when the batteries go down.