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Yep, that's all stuff I know :)
Is there any reason having the cooler on while the leisure battery is charging (from the alternator, no mains for now) would cause issues? Then just disconnect from the starter when the engine's off and let it run off leisure?
No plans to run it all the time, only after a big fresh food shop and when we need to keep beers cool for half a day or so...
atk-
The split charge system should stop current flowing from the cranking battery to the leisure side when the engine's off or the cranking battery's low. Shouldn't have to manually disconnect it. If your alternator is undersized and the fridge is way above target temperature, there might not be enough left to charge the leisure battery.
Emyr
Depends what your duty cycle is like. How much driving vs parked, any mains hookup etc.
Fridge would almost always be on the leisure circuit: being stranded is worse than having a few gone-off things in the fridge.
The battery designs used for cranking and leisure are different. Cranking batteries deliver high current but are expected to be recharged immediately after doing their work. Leisure batteries are typically rated for lower current but can be run lower before charging without completely killing the battery.