It is definitely a ground/electrical issue. No way in hell all that stuff is going bad at once and it be as random as it is. I would check that ground the guy mentioned with the video in his post. Also since it is affecting the camera in the rear and you mentioned the trailer hitch area, the "power block" that goes into the back of the bumper and comes out where you attach your trailer hook up has been problems for previous people Ive read about. Dirt and water can get up in there and over time rust components or cause arcing of different wire connections at the trailer hookup. If you can get in there and clean it that COULD be part or all of your issue.
Good luck, electrical shit is a nightmare but usually very obvious once you "see/find" it.