If you have the newer RT trailers with the 6 inch oval tail lights, you can integrate back up lights fairly easily. The blue wire in the 5 pin wiring harness is powered when your vehicle is in reverse. In the older trailers, this wire only went to the brake solenoid on the Master Cylinder. But, on the new trailers this blue wire goes to both tail light connectors. That being the case you can replace the existing LED tail light with one with integrated back up lights. You will also need to splice in an additional connector.
My trailer is a 2018 made by EZ-Loader so I don’t know when Ranger started integrating the blue wire into the tail light wiring harness, but you should be able to see it like In the pic.
These are the required parts: From e-Trailer.com