Sandia Man wrote:
The Iota 45 amp converter is just fine for 2 batteries but you must get the IQ4 module (less than $30 online) and plug it into the side jack to make it a smart charger.  
This is what I have decided to do.  $50 (for us Canadians) for the IQ4 and no swapping the converter/charger.  On the batteries, I will look for a pair of 6Vs.  That'll get me 225 Ah, or about 110 Ah usable.  
I had already swapped to all LED lights.
I have bought a stove top coffee maker to replace the electric unit.  That is likely the biggest improvement.  
Thanks to all who posted helpful posts on topic.