Review on Trailer Indicator Waterproof Surface Installation by Patrick Goodrich

Nice blocks but installation was a chore. My trailer frame is steel and I had to ground the black wire (the only hot wire that powers my trailer) under the light to one of the mounting bolts as ground. The mounting screws are soft and the heads are heavily deburred, so I had to use heavier gauge self-tapping screws to drill holes and then install the factory screws. I replaced the two serrated heads with my own screws and their heads were a bit taller so they interfered with the light on the back. The plastic back of the light had cutouts for the screw heads, but for some reason not where the screws were! pinched at one end and the other end needs to be pryed open with a tiny drill to get it in place. You need instructions so you don't break anything. I've been lucky. Anyway, I got through it fine and they worked fine. It just took longer than I thought.