Guessing it's a Trailstar, i.e. all the wires are run inside the box tubing, so you can't see any of it. There are 5/8 inch holes in it where the side marker lights are. How the heck to you get to this marker light wiring? That hole is tiny! How did the originally wire this thing? I have to pull the old lights off then pull new wires through, and I'm afraid I won't be able to rewire the side marker lights...