One of the external switches I saw was actually a 4 way switch (left, right, rear, and front).
I thought it would be cool to put a camera on the roof so as to check for clearances. I had a problem last summer pulling out of a spot that had a overhanging tree limb, and I almost hit the top of the coach when pulling out.
I have not narrowed down any brand yet; just thinking out loud.
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The only thing that works on a RV is the owner...
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