The switch at the battery isolates so that it can't discharged by loads in the trailer that don't have switches to turn them off. The key device is the gas detector. It goes all the time when the battery is connected and can kill the battery in 3 or 4 days. If you have shore power connected, the battery should be connected to the converter, so that it can charge the battery.
Your mention of a second battery switch has me a little confused. There shouldn't be one in the converter panel. I think that you are talking about the shore power AC supply breaker. Turning it off will not turn off the battery. It only turns off your AC loads and the converter.
When I store the trailer for any length of time, I always disconnect the battery.
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Cheers
Helen & George VE3INB and Max (Bichon Frise)
2006 Chevy Silverado 2500HD D/A,
Isspro EGT & Boost Gauges, Rear View Camera System, Prodigy Controller. Custom Auxiliary Fuel System
2014 Keystone Avalanche 295RL
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