Weight capacity: This boat trailer jack is designed to support up to 5000 lbs (2000 kg), providing a strong foundation for larger boats on a trailer. Lift height options: Vertical lift options include 25.4 cm (10 inches) and 38 cm (11.4 inches), allowing you to match trailer tongue height to ramps, bunks, or hitch heights. Mounting compatibility: Includes 10 cm bolt fasteners and supports trailer mounting pieces up to 10 cm x 11.2 cm, enabling straightforward installation on compatible trailers. Construction and finish: Built with seamless precision steel pipe and finished with a galvanized surface, this jack is resistant to rust and designed for durability in challenging environments. Wheels and fasteners: Features 6 inch reinforced universal wheels with stainless steel anti loosening nuts for enhanced safety and long term durability during traction and movement. Key benefits and why customers may need this product load handling: The 5000 lb (2000 kg) capacity supports a wide range of boats, contributing to safer and steadier trailer handling during launches and recoveries. Flexible height adjustment: The two lift heights help accommodate different ramp grades and trailer tongue heights, reducing the need for additional shims or manual adjustments. Broad compatibility: The mounting piece dimensions and bolt fasteners are designed to fit a variety of trailer configurations, simplifying setup and reducing compatibility concerns. Durable, rust resistant: The galvanized finish and steel construction resist rust and wear, extending service life in coastal or wet conditions. Safe, stable mobility: 6 inch reinforced wheels with anti loosening nuts help maintain stability and reliability on uneven surfaces or when repositioning the trailer. Use scenarios Launch and recovery on varied ramps: When preparing to launch, raise the tongue height to clear the hitch and ensure a smooth approach to the ramp; the two lift options provide flexibility for different ramp slopes and boat sizes. On uneven or soft ground: While performing maintenance or adjustments at the boatyard or waterfront, set the appropriate lift height to work comfortably at eye level, then reposition the trailer as needed without losing stability. Coastal or saltwater environments: The galvanized finish and rust resistance are advantageous when storing or operating the trailer near saltwater, helping to extend jack life with less maintenance. Notes Please verify mounting piece dimensions (up to 10 cm x 11.2 cm) against your trailer configuration to ensure proper fit. For performance, inspect the bolts and wheel nuts for tightness and corrosion resistance periodically, especially after exposure to water or salt air.