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 trailer couplers also feature replaceable latching hardware for longer service life. Bulldog straight couplers are offered in a variety of styles and weight classes. Designed to match trailer tongues for a perfect fit no matter what style of trailer you may own, Bulldog Collar Lok couplers are the strongest in the industry, and are well suited to utility, livestock, cargo, and construction trailer applications. An automatic and continuously tight ball fit design delivers secure and dependable operation. A clear, visual indication of proper closure provides unparalleled safety and confidence under day to day operation.