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A Gooseneck 30K 4" Square is a heavy-duty, 30,000-lb rated, square-post gooseneck trailer coupler (4-inch square shank). It's a component used to connect a gooseneck trailer to the tow vehicle’s ball.
A Gooseneck 30K 4" Square is a heavy-duty, 30,000-lb rated, square-post gooseneck trailer coupler (4-inch square shank). It's a component used to connect a gooseneck trailer to the tow vehicle’s ball.