Charging help

We had a meltdown yesterday and I'll post pictures a little later. Shore power is gone. I'm new to the 2 six volt battery campers. I'm going to have to either borrow a generator or go into town and get a battery charger. My question is do I leave everything connected as is and charge as 12V or do I disconnect and charge individually at 6V? We still have 3 days of camping. Thanks.