We have a different motorhome, but our house batteries are charged by the chassis engine as we drive. Don't know for sure if the battery disconnect switch affects that or not, but I think it doesn't matter. It appears that our coach battery and house battery are connected independent of the switch.
The battery disconnect switch does disconnect almost everything in our coach that's 12v.... with the exception of the automatic steps which can only be disconnected by physically disconnecting the battery.
Basically, since there are no diagrams for this stuff, you have to experiment to see what powers what.