I spent WAY too much money, but I like what I finally have installed. Bought this system from 4UCam
https://www.amazon.com/Quad-view-FRC...2595169&sr=1-2 - but I also added two more cameras (side style - right & left side).
Added a camera below the front TV mirror looking forward. Took out the Furrion rear mount from our 5er and installed the rear facing 4UCam. I have 40' toy hauler so I ran a coax nd rubber duck antenna into the pin box area, the wireless was a little too far and too much heavy metal in the way so it was fading in/out until I ran the coax. All four cameras record to a 32GB chip in the monitor, so I've got evidence of what might happen. (including MY SCREW UPS!!!!) More views than anyone really needs, but keeps my co-pilot /DW happy. And, we still use radios when backing up (HA HA!!!!)