Towing w/out rear camera

I went with a voyager rear camera with 7 inch screen. I have a 102 inch wide x 20 feet long pj trailer I haul everything on. I bought the camera mainly so I could check the deck out for items that may have come loose or wiggles too much. I really like the combo wireless camera and I mounted it right above the door. The power I stole from the rear light switch. And at night I move the screen into the camper for a security cam to see who is at the door before I get out of bed.