For more than three quarters of a century, Bulldog round and square trailer jacks have demonstrated to be the most reliable, field-proven jacks on the market. Tough and trusted, they’re built with uncompromising strength and materials engineered to hold up under rigorous working conditions. By operating smoothly and efficiently, Bulldog jacks and our complete line of heavy-duty trailer couplers will protect your valuable equipment for decades of normal use – virtually maintenance free. See for yourself why Bulldog round jacks are recognized as the industry standard by leading agricultural, commercial, horse, livestock and other trailer manufacturers. * Easy Cranking * Smooth, Comfortable Ergonomic Design * Dependable Vertical- and Side-Load Capacity * Proven Reliability for Long-Term Use at Rated Loads * Precision-Fitted Parts for Extra Stability * The Bulldog brand is owned by Cequent Consumer Products, Inc., part of the Recreational Accessories business segment of TriMas Corporation.