Re: Wiring extra battery
No one can tell you if the batteries you have will be adequate for your uses as the number of factors to consider is long, as is how you will use the batteries from day to day, month to month. Type of batteries, draw from all your devices (including refrigeration), location you will be cruising (hot, cool, etc), age of the batteries, how they have been maintained, etc. etc.
You should not, however, have a separate battery for the refrigeration as another posted has already said. The refrigeration may be the biggest draw of all your systems, but it all depends.