Hi Jim!
The back of my trailer looks very similar to yours. I just spend some time in and around it, and came up with an idea:
- take the red cap off of that light in the center, and take the bulb out.
- place a box like
this over the light with a cutout for the light base so the box fits over the light. Attach with screws.
- attach the camera to the box lid / cover.
The box would be easy to seal / caulk around. The wiring would already be there and the camera would turn on with the truck's lights.
Any thoughts, concerns, problems with that?
I could even use machine screws with washers to attach the box, there is a piece of trim on the inside at that location that easily would hide the screws.