Nice!
Have you seen the Ford Mytouch Lockpick? You could ditch that secondary monitor altogether and support numerous camera feeds.
https://www.coastaletech.com/mytouch.htm
I sort of have a similar setup where I use a wireless backup cam installed on the rear of my toy-hauler. It then transmits to a receiver mounted in the cab of my truck, which produces a wired camera input. From there you can plug into any monitor including Lockpick. Presently I plug it in as a camera source to a Garmin RV GPS, but might go the Lockpick route in the future. Just thought I'd share the various options...