I bought a full size 2016 Ford F150. It did not come with a backup camera. I would like to buy a rear-view mirror based backup camera system. It should automatically turn on when shifted into reverse. Is an audible beep useful? I saw an Echomaster system for $199 at Best Buy that had a good, clear image in the live store display. From this pricepoint, the units rise to $500 - $600. Installation adds another $150 or so. There are currently no backup camera systems on Massdrop. Any comments on the Echomaster, or any other systems that you have installed? Any recommendations?