Lifting capacity and travel: This trailer guide wheel supports a vertical load of 540 kg, with an additional travel of 25 cm and a lifting height of 28 cm. Durable wheels: 6inch solid ammonia polyester wheels with density, offering greater durability than traditional plastic or rubber wheels. Heavy duty rotating mechanism: A folding guide wheel with a pull pin activates a swing mechanism, allowing the jack to swing up and out of the way when not in use. This design simplifies lifting, leveling, and adjustments. Easy bolt mount: Comes with mounting fixing bolts to fit trailer tongue socket frames up to 9 cm by 12 cm, enabling straightforward installation. materials and corrosion resistance: Main body made of steel with a galvanized antirust surface, validated by a 72hour salt spray test to resist rust in harsh environments. Use scenarios Boat trailer setup: Use the lifting function to raise the boat for hitching and docking, then swing the guide wheel aside to keep it out of the way during launch or recovery. The 540 kg capacity supports common boat trailer loads, and the 28 cm lift helps accommodate different bunk heights. Utility or equipment trailers on uneven ground: Apply the jack to level the trailer on slopes or soft surfaces, then fold the wheel mechanism away for stable, stationary positioning during loading, unloading, or maintenance. Camp or outdoor use with cargo trailers: When parked on irregular terrain, use the lift to achieve a level stance for easier access to cargo, then fold the wheel out of the way to prevent obstruction during travel.