I confess to being a little confused. Presumably, you have two 6 volt batteries wired together in series to provide 12 volts. If that’s the case, you can treat them as one 12 volt battery and you would have no reason to need a 6 volt charger.
As for monitoring your batteries, the 105s are flooded batteries with caps, right? A good battery hydrometer should be all you need to monitor their condition.
Am I missing something here?
I don't like to make plans. They cause the word "PREMEDITATED" to get used in court!
DON'T FEED THE VULTURES!
My Body is a Temple! Ancient, Crumbling, Probably Cursed . . .