A Trailer Builder assembles, welds, and constructs trailers used for hauling goods, vehicles, or equipment. They work with various materials like steel and aluminum, using hand and power tools to cut, shape, and join components. Responsibilities often include reading blueprints, measuring and aligning parts, and ensuring structural integrity. Trailer Builders may also install electrical wiring, lights, and brakes. This job requires mechanical skills, attention to detail, and the ability to work with heavy materials.