If you put your switch on either cable coming off your battery, that is the same as disconnecting your battery IF, and I say IF there are NO OTHER CONNECTIONS to that SAME BATTERY POST.
Several RVs connect a separate wire directly to the battery to power the tongue jack, slides or electric door locks. Just make sure there are no OTHER wires going to the same terminal that your switch is connected to. If so, disconnect them from the battery and reconnect them past the switch on the coach side. That way everything is disconnected when you turn the switch.
Hope this helps.
2013 Silverado 2500 HD Duramax/Allison Tuned
Aviator Wright Flyer #1919
"First In, Last Out". 11B4Y
DAV, MOPH, VFW, 5/7 Cav,1/8 Cav Assoc.
11th ABN Pathfinder Co. N7MIP