Wow these work great. Installed in 10min on 2018 jayco 26bh. Picture quality is good no lag from camera. Program left to camera 1 right 2 camera and set rear camera to camera 3 on monitor and you can run split screen. Now isee down the sides of my trailer all the time.
https://www.amazon.com/Haloview-CA112-Wireless-Marker-Cameras/dp/B0818M1QLG