Hi there Medina, I'm down here in Jackson Township close to Massillon.
I have a 267 BH I installed my wireless rear view camera just below the center marker light. I drilled a 1" hole to run the wire. Pulled the marker light out to access the writing. I also contacted the dealer to get a scematic of the framing.
You want to make sure you seal up around light and camera. I used a rubber grommet from Ace to keep wires from getting rubbed bare.
You will find plenty of others in the forums that have install rear cameras. Some will have pictures. Check on trailer life online.