Shop Nilight Boat Trailer Dolly Solid Steel Heavy Duty 600 Pound Capacity with 12Inch Polyurethane Tires 1-7/8Inch Hitch Ball in high quality, support 2 year warranty. Heavy Duty Steel Construction Thick Welds for Superior Strength Built for Long Lasting Durability and Rust-resistant, Black powder coated for long lasting corrosion resistance.