Be sure to keep a close eye on your batteries and not let them get over charged and boil out the fluids... leaving 13.6 VDC and higher DC Voltages on your batteries for long periods of time can do this...
The smart mode chargers will drop this back to 13.2VDC when the demand is low which keeps the boiling out of battery fluids to a minimum. When the battery fluids gets below the cell cores the risk of shorting out the cells is hugh. Shorted out cells means game over for a battery...
The same close watching of the batteries also goes in the other direction... Allowing your batteries to get discharged below their 50% charge state is like driving a nail in their coffin performance wise... I monitor my battery Voltages like a hawk when in a situation like this and not ever let them get below the 12.0VDC mark which is approximately the 50% charge state.
Having our good smart mode converter/charger on-line really takes care of my batteries for me almost automatically... I still watch them very close out of habit when camping out for extended times like you are doing and its a great feeling finding things are taking care of themself. It is a maintenance routine that pays off big time not having early replacement of my batteries...
Roy Ken