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Well, I took it apart and found a 12mm (+-) blanking rubber grommet just below the tail light. The right side one is ideally suited for routing the 4 wires through as they will drop right behind the bumper and reappear next to the tow bar mounting points.
I have made a simple sniffer-circuit that senses brake and turn (l+r) signals and the normal rear light. The CAN BUS has no idea it's there and it will draw current from the free pole located in the battery power distribution box and pass it onto the 4 wires.
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