Video mode for backup camera...check trailer load...constantly record?

Hi and thanks for any help in advance, and afterwords as well if it is good advice. I want to install a switch somewhere that will allow me to check the rear camera while I am driving. I haul trailers a lot it would be great to be able to check the camera feed every so often so I could see how the stuff on the trailer is riding and how the straps are doing. Is this possible? I am thinking it should be pretty easy if you knew what wires to tap into. My sister just bought a Volvo and it has one of these switches from the factory.
Also, I think it would be cool if there was a way to keep the stock setup and have a way to constantly record the footage from the rear camera.

 

Check out this thread:

https://www.tacomaworld.com/threads/09-anytime-on-rear-view-camera-with-switch-on-dash-mod.179242/

 

Will do, thanks. I've already spent so many hours on here researching suspension and winch bumpers I just didn't have the time to invest in another topic. Haha.