T&T: multiple battery banks

[Ekcine]

The boat I'm looking to buy has a space for 2 8D batteries. I'd like more 
capacity but there is no one large space for that. I can place a second bank 
under the bed.
So I'm considering 2 house banks. There are chargers that can charge 3 
separate banks.
Looking for suggestions on how to split the 2 house banks. Should I power 
the refer off one and all other house needs off the other or should I run 
everything off one bank one day and then everything off the other bank the 
next day...or something else?
The first bank would be the starter battery and that will be different than 
the first house bank but does the second house bank have to match the first 
house bank in size or type of battery?


Ed K
ekcine at comcast.net