LC twin batteries: Can I isolate and use as dual system

We just got a 2nd hand diesel LC and it has two batteries in it wired in parallel (not isolated). Toyota say they are a must for starting. One mechanic even suggested "not" to split them into main and aux. So far we only have the fridge being wired up as the only accessory.

What should we do? Get a third battery for the fridge and accessiries (not many yet) etc or just hook into it as is?

Our first trip is in May.

Thanks all
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