Not sure what truck you have, but I got a camera from Camera Source that mounts on the camper and plugs into the tailgate camera connector on the truck. It works just like the tailgate camera except the video quality is not as good. I have a 2017 F350.
I have a 2012 Ford F-350 and it doesn’t have a Tailgate Camera Connector. The RV Camper Dealer has a couple models that mount up near the clearance lights at the top of the Camper and those are crazy priced.
