Distance is hard to judge, especially in a video image. The high mounting point provides a downward looking perspective, making it easier to judge how much space you have left. The lower mounting point would allow a more level camera angle, letting you see further back; aside from use on the road, this could help line up into the site from further away. Ideally, I would like both, but my I'm okay with our motorhome's stock high-mounted camera, and our old trailer doesn't have a camera at all - the replacement woud get at least one camera.
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