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Be careful with large capacity batteries. If you don't charge them fully, they will slowly die. And if you add those extra batteries, look at motorhomes for battery wiring. Coach and chassis batteries, both charged by the alternator, but when certain conditions arise (ie engine off) the chassis battery is disconnected from the coach battery, so not to drain it. That ensures you don't drain your battery so you can't restart the motor.
Make sense? I couldn't create a diagram for you, but it's a very simple system using diodes for isolation. Keeps the batteries from charging/discharging each other. The alternator will charge both, but when you EOC only the second battery will drain, your primary will stay healthy for the next morning when you need it.
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