Try these below. I installed a backup camera on my 5th wheel and TC for about $70.
ODGear Backup Camera and Monitor Kit For Car ,4.3'' LCD Car Rear View Monitor Night Vision Reverse Backup Camera Waterproof https://www.amazon.com/dp/B01M6UIS25/ref=cm_sw_r_cp_api_ORreAbCXADT5Q
REARMASTER 12V Cigarette Lighter Power Supply Kit for Car rear view camera and Monitor with RCA connection https://www.amazon.com/dp/B01N2T53ZR/ref=cm_sw_r_cp_api_1SreAbDSDBD4W
ATian Waterproof 18 LED Car Rear View Night Vision Reverse Video Backup Parking Camera Black Color https://www.amazon.com/dp/B015J0CGIY/ref=cm_sw_r_cp_api_BTreAb7ZJD0MG
RCA Plug DC 2.1 5.5 MM Power Video AV Extension Cable for CCTV Security Car Tuck Bus Trailer Reverse Parking Reverse Camera 15 Meters 50ft by HitCar https://www.amazon.com/dp/B00DVZYCZA?ref=yo_pop_ma_swf
