Well,,, I thank the OP for posting it, I think it is a good idea, but my back up camera has no mic so we would be stuck on one-way
I do have an GMRS license though, and a pair of FRS/GMRS radios (Actually 4 or 5) and CB's including one hand held and in many parks our cells work... Mine hands free (Very useful) so we have person-person-comm links
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