Another data point:
The "Battery Disconnect" on my trailer, only disconnects the battery from the WFCO 12V distribution centre/charger.
With the WFCO disconnected by this switch, IIRC, I can operate the Slide, Stab jacks, Awning directly from the batteries. They can be operated manually or by a remote, so the electronic remote control receiver must also bypass the Battery Disconnect.
I can also operate the Brakes (via their emergency disconnect), and the factory mini solar panel is directly connected to the battery (as are my Solar additions).
And to the O.P., I'm quite sure the charge line from the TV is directly connected to batteries and not through the Battery Disconnect.
When Equalizing the batteries via my Solar controller, I (should) remove the main, non-solar battery cable (and not rely on the Disconnect) to protect the remote control receiver. As not sure how well it handles the 15.9VDC.
These trailers are getting too complicated ...