ISO Automated/Electric Trailer Hitch Coupler

I have an old car door mirror (just the lense) that I spring clamp onto my top hinged rear glass window on the explorer. Then I take the piece of string with a hook on each end and run it from the latch on glass, down to the safety chain loop on hitch. The glass struts keep the string tight and mirror at the perfect angle that when I look in my rear view mirror, I see the ball and about 2 feet of ground beyond the ball. My friend who uses rear view camera says my view is BETTER! It takes me less than one minute to set up, and hook up in one shot every time.