Is there a source for the Bargman lights? I found a couple on Amazon, but the source linked above says 404 error. I tried Bargman directly, and got only one simple trailer light, looks like for a utility trailer. Amazon has other brands available, though.
My trailer doesn't have an electrical connection at the back since there is no bumper. I'm thinking that, for now, just putting larger lights on in place of the dinky ones the factory used would help. I think I may have access to the backside of the tail lights if I pull the couch and end tables out. That may let me add a horizontal light just below the rear window.