Review on Efficient Nilight 2PCS Square LED Trailer Light Kit: Submersible, Low Profile, IP68, Stop Turn Tail Marker License Light for 12V Utility Trailer Boat Camper RV Trucks Marine Snowmobile + 2 Years Warranty by Tyler Owens

1. Tail and side lights use a separate ground wire instead of relying on the ground path created by bolting or bolting the light assemblies to the trailer's metal frame. The ring terminals provided for grounding are tiny, not as shown in the product photo. The easiest way to ground your taillights is to purchase a larger spade, cut the excess ground wire, crimp or solder the wire to the spade, and tighten the spade under one of the two rear studs. I had to enlarge the hole in the ring a bit to keep it from slipping over the lugs. Using a hammer and large nail to widen the hole worked better than trying to drill it to size. Taillights with rear studs fit in the same holes as the old lights on my 16ft flatbed trailer.3. The side lights are wider than usual and too wide to properly fit in the 2" square tube where these lights need to be installed.