All dash cams have a primary function, videography of what's in front, and in some cases what's behind you. You can spend hundreds of dollars on a device that may or may not ever capture anything worthwhile.
https://www.amazon.com/YI-1080P60-Da...ds=yi+dash+cam
This cam is $50, has good reviews and good video along with a free smartphone app.
My GMC Yukon has all kinds of lane detection, vehicle distance detection, and blind spot detection, I don't use any of it. I use my mirrors and that swivel device just below my head. I installed a 9" quad view monitor in the coach that allows all three cameras to be used at the same time. I keep the monitor set to the rear camera only, if I want to see what's beside me I look in the mirrors.
I developed the habit a long time ago of being constantly being aware of where traffic is around me in case of an emergency, I can see more around me with the mirrors than I can with the cameras.
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