ROAD DAWG Boat Trailer Jack with Single Wheel 6 Inch,1000 Lbs. Capacity Swing-Back Bolt-On Heavy Duty Swivel Tongue Trailer Jack,ATR39001MB-1.Lift Capacity: 1,500 lb. 1/2 Ton Retracted Height: 10-1/2 inches 267 mm Extended Height: 20-1/2 inches 521 mm. Constructed with high-quality zinc-plated corrosion-resistant steel, ensuring ultra durability and protection. Bolt-on bracket can be easily mounted to 3" to 5" trailer tongue and folded up when traveling. Features a side wind handle with integrated grip and a 360° swivel 6" Nylon wheels. Comes with bolt-on mounting hardware for installation and includes a limited 1-year manufacturer warranty.boat trailer jacks are built to thrive under water exposure, equipping your boat trailer with a dependable support for miles to come. These trailer jacks also feature a jack wheel to give the boat trailer enhanced mobility when coupling to your vehicle or launching your boat at the boat landing.boat trailer jack is equipped with a trailer jack wheel at the base, giving your trailer enhanced maneuverability without requiring you to fully lift up the trailer tongue. This makes parking easier, coupling easier and launching and positioning your boat easier.