Bulldog trailer couplers are the standard by which all others are measured. No other competitor offers the combination of Heavy-Duty materials, unique features and replaceable parts for outstanding performance and long life. That’s why Bulldog is the right selection for your Heavy-Duty towing needs, whether its utility hauling, horses and livestock, cargo or construction trailer applications. Bulldog A-frame couplers are a Heavy-Duty design, often specified in commercial, farming, and ranching applications. Available in both a Heavy-Duty wedge latch style, and a Heavy-Duty Collar Lok style, both are rugged and durable designs that will provide years of service. Collar Lok A-frame couplers are available in a range of capacities from 5000 to 15000 Pounds Gross Trailer Weight. The Collar Lok feature offers a patented, industry exclusive, continuous tensioning for an “Always-Perfect” fit and worry free operation. Constructed of high strength steel for 50 Degree trailer tongue.