Update
While tracing the wiring back to the inverter I found the neutral leg from the shore power to the terminal block located at the inverter was loose. To be honest it looked like it had never been tightened from the factory.
After running on shore power all day my voltages on both batteries 13.608 volts. I did connect the ground to opposing battery as well.
My voltages have dropped down to a more respectable level and after 8 hours both batteries appear to be cool.
I will continue to monitor the system to see how it progresses.
I definitely like the 6 volt battery idea and will look in to it for our new Fleetwood MK-35H scheduled to pickup next month.
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