Trailer components, including couplings, couplers, hubs, tailgate locks, boat trailer parts, roller trailer parts, utility trailer parts, skids, rollers, spring hangers, tandem rocker kits, u-bolts, brackets, hinge straps and metal pressings, various kinds. Custom manufacturing metal devices, including pressing, drilling, bending, folding, robot welding, laser-cutting, laser cutting, and assembly operations.