Profile: The Advance Metalworking Co., Inc. builds agricultural trailers. Our Lift-a-Load® elevating platform trailer is hydraulically lowered flat to ground height or raised up to dock height. Our hydraulic lockout valves and steel travel locks provides double protection from trailer lowering during transport. Our gooseneck/fifth wheel hitch features include better hitch, load transfer to tow vehicle, sharper turning radius and shorter truck/trailer combined length.