Another recommendation for a back up camera.
I use the camera system for both, my travel trailer, and my truck camper. I have one monitor (clips onto the rearview mirror) and three cameras. One on the travel trailer (permenantly mounted with cabling to front of the trailer), one for hitching up the travel trailer, and one for combination rear view / hitching up a utility trailer, with the TC. I wired the truck with extra long video / power cable, and plug in which ever camera I am going to use. I have the cable coiled up by the tailgate, and pull out what I need to plug in which ever camera.
On the TC, I use velcro straps to mount the camera, either on the ladder for road use, or, on the hitch receiver for hitching up the trailer. It's a great help for backing the trailer.