On my 40 ft Journey, they are mounted on the sidewall to provide a clear unobstructed view behind. Power is from the interior of the coach using the side turn signals either directly or as a trigger for an electronic switch. For what its worth, I find mine next to useless when comparing their utility to the side mirrors. I find it difficult to look down at the dash monitor as you lose sight of what is happening in front of you. By comparison, I can still see what is happening in front of me with my peripheral vision while looking at the side mirrors. At night, there us no real way to judge perspective and estimate where another vehicle is when you only see two bright lights. I suggest you solicit more opinions as to their real value. I don't know if the newer cameras mounted in the mirror itself solves my issues. It is one "feature" on the coach that I could completely do without. Just thought I would offer an opinion. Good luck,
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Bob
09 Journey 39Z
Southern Ontario
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