If/When you’re ready, if cameras are your trump card, look at GMC. For the moment at least, they are killing it. My new one has 7 cameras, and a port on the bumper for a trailer cam, located either inside a cargo box, or on the back (to maintain 360deg view). (Mine was <$100k…much!)
ETA -
As far as a screen ‘mount’ is concerned, perhaps look at a new stereo (aka head unit, in today’s world)? Many offerings include an option for camera integration and will be as secure as the original stereo. And new stereos can be had for less than a new truck!
We return you now to your regularly scheduled OP topic.