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Pretty sure there is no external input to feed another camera signal, and from factory the camera function will not work over about 10 kph, pretty rubbish in this day and age, but Nissan can't even give us car play, so thinking about caravan owners would be the last thing on the list (lol)
Plenty of aftermarket head units appearing now, it means spending more coin and pulling your car apart, but some do look pretty good and have great functions including i believe extra camera inputs.