Having give up hope of fixing the existing reversing camera I am looking to replace it.I would like one of those dual cameras which have one pointing towards the tow bar area and the other looking back along the road.I have an onboard system which allows for video in but I'm not sure how you then select between the 2 images.Can anyone recommend a decent system please?Would prefer wired as opposed to wireless because I have read of wireless images freezing.Many thanks.