CE Smith 27656 Trailer Guide-On LED Light Kit CE Smiths tough, long lasting, waterproof, shockproof LED post guide lamps make it easy to see your trailers position when backing down the ramp and dramatically increase your trailers visibility over the road at night. These lights are easily installed they screw onto the top of your guideposts and wire into your trailers tail lights. LEDs are long-lasting, energy efficient and more durable than incandescent lights. One piece lamps fit easily on top