DPDT Switch for Battery Bank

Now that I have the bank 1/off/bank 2 switch installed I have a question about compatability. I have the mains AC on from shore power with the converter on to supply 12V to the 12V panel and charge?? back to the 12V tongue battery (bank #1). The bank selection switch is on #1. At this time bank #2 is isolated and being charged by the solar panel and charge controller. both banks share a common -ve ground. Tongue battery 12V grounded on one side of trailer at brakaway switch. 2 (6V) batteries grounded on frame on opposite side of trailer. As long as I make sure the convertor and ac main switch is off when the 12V panel gets supplied from the Bank #2 everything should keep working. Just means bank #1 will sit by itself and not get charged. The electronic circuit for the dometec fridge (on propane) and the LP Gas monitor only draw 0.4 a. When the 12V fantastic fan kicks in then it jumps to 1.6 A. Have 220 Ahr capacity versus 60 to 80 on the tonguje battery. Thanks