I bought this monitor and camera a few years ago and it has performed flawlessly.
https://www.amazon.ca/gp/product/B004Y3FE6O/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
https://www.amazon.ca/gp/product/B0079R2MH6/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
Our C has a rear window. After trying the license plate I moved the camera to the inside top of the rear window frame and set it so I can see to back up very close to a trailer or a post. I mounted a switch on the base of the driverโs seat to power up the camera and monitor.
2004 E350 Adventurer (Canadian) 20 footer - Alberta, Canada
No TV + 100W solar = no generator needed