Most motorhomes are designed so that their basic functions work from the 12V leisure battery. So you can park in the middle of a field, with no hookup, and have lights, a loo, a heater to keep warm, a hot shower and a fridge to keep the beer cool. The appliances are controlled by 12V, but their main heating power comes from gas or diesel.
As for sockets, the 12V round sockets will probably work from the leisure battery, but the ones in the cab area may work off the starter battery, and might only work when the engine is running. The 240V 3-pin mains sockets will only work when connected to a hookup, as has been said already.
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