I have been thinking about fitting a reversing camera. It would be wired as this is more reliable and I ran a pull wire when I was doing other work.
I am interested in peoples' experience of twin lens cameras, where each camera can be rotated up and down individually. One lens is narrow angled to use as a rear view camera (as you can judge distance better with narrow angle), the other lens is wide angle for close up parking.
Also I would prefer a smart mirror with built in 7" screen which clips over the existing rear view mirror, as opposed to a screen sitting on the dash. For example -
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