There are variations in how things are wired.
On my motorhome, on one side of the disconnect are the house loads, and on the other side are the battery, converter, battery combiner relay (which allows the alternator to charge the house battery when the engine is running), and a couple of always powered loads--the entrance step and the dash radio clock/memory line, I think.
Often the converter is separated from the battery by the cutoff switch and so always connected to the house loads, rather than being connected to the battery and isolated from the house. Sometimes there are other always-on circuits, such as the propane and CO detector, slide motors, etc. On travel trailers, the emergency breakaway brake system should always be unswitched.
