The issue with the reversing camera (I think) is that it is suppose to zoom to make it easier dock the tow ball with the trailer coupling. I am not sure if an aftermarket tow bar setup would do this. Also the high cost of the BMW installed towbar is due supposedly to the time spent reprogramming the car's computer. I think that I read somewhere that if the trailer starts to fish tail the car computer will recognise this and start to take corrective actions (I need to find out more about this).
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