Could there be a simple link?

Mr H

Many cars these days have quite sophisticated rear cameras, linked to a in built screen on the dashboard. It seems, there should be an easy way to use the same in-car equipment, for a rear caravan camera. Does anyone know whether there is something on the
market, that would include a switching arrangement, from one camera to another? Already when I connect up the caravan electrics, it switches off the car rear camera so could this switch on the caravan one?