And with these 2 6v cart batteries wired in series, to act as one 12v battery, regarding charging, the second bank on my charger would be coinnected to the + or 6v batt 1 and the - of 6v batt 2. Correct? This would then charge the batteries equally? And with this method, I just increased my amp/hour with 2 6v over the 2 12v accesory batts and made a true "dual" 12v setup for the charger to work as designed?

I mean, am I missing something, or am I appropriate in wondering why on earth people would go with 2 12v batteries for accesory with lets say a 115 amp hour rating each when they could use 2 6v batts rated at approx 205 amp hours each?

I feel like the dual 6v in series makes more sense and is so simple it's brilliant, however, David, I have seen several of your installs and have seen no trace of 6v batts. Which makes me wonder what I am overlooking.