I got this magnetic rechargeable camera that talks to my phone. I use it when hitching up, then when we get to the site I use it to back up the trailer. https://smile.amazon.com/gp/product/B08S6PQKYZ/

While I would love to leave it on the trailers AC for visuals while underway, I would be afraid that the magnet wouldn't hold at 65 mph on a bumpy road. But for something that doesn't need any tools or wiring, I'm really pleased with it.

I bought this one: https://www.amazon.com/gp/product/B08S6PQKYZ/ I love it because it talks to my phone (via wifi, not bluetooth), so I dont need another display. I can basically hitch up now without help. And though I do put it on the back of my trailer when backing in, its not as helpful as a second set of eyes talking me in, not sure why. Since its magnetic I can put it wherever it sticks, but you cant leave it there while driving at freeway speeds. It holds a charge through a lot of uses.

This is actually my second camera of the same type, a colleague who got a boat loved it so much he basically stole mine and paid me enough to go get a new one. My only criticisms are that the cover for the charging doesn't fit in to seal it, and the charging port is weird and round (not micro USB or USB C or something easy) so don't lose the charging cable.