This was the camera system I used, it has four cameras. The left and right cameras activate with the turn signal and the rear camera activates based on the backup light.
https://www.amazon.com/gp/aw/d/B010I2QBF2?psc=1&ref=ppx_pop_mob_b_asin_title.
I had to use time to lay relays to keep the signals active since the turn signals get their power from a flashing unit and there's no way to get a solid signal from the turn signals.
https://www.amazon.com/gp/aw/d/B071XNY72Q?psc=1&ref=ppx_pop_mob_b_asin_title.
The camera system has a ridiculous amount of camera wire basically enough for one of those really long bendy buses. One cool feature is you can send a photo you take from a drone or a photo you got online of what your truck looks like from above and they'll send you a file to make it look like that and the bird's eye view.
Also I'm not a proponent of Amazon or cheap Chinese crap however I couldn't find these for a decent price elsewhere and I couldn't afford the ones I really wanted to get. Also I didn't want to accidentally break down my fence again like I did the first time I backed up near it!
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