Tow bar electrics for my 45

half way to getting my touring caravan i have just bought a tow bar for my 2002 rover 45 but has no electrics what system would be suitable for my cars electrics as i will need a double electric system i have seen a universal system with cars that have bulb warning light systems mine does not is this ok for my car iv'e no idea what is cambus and multiplex wiring ?? any help on this please

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