"The Tow Tuff Heavy-Duty Adjustable Trailer Dolly with Caster features a patented adjustable ball that moves up and down and forward and backward. This ball adjusts from 18"" to 22.5"" in height and forward and backward in four 1"" increments. With a 1,000-lb. capacity, this heavy-duty dolly lets you move a wide variety of trailers. It's constructed with a solid steel frame and hammer-tone powder-coat finish for durability and corrosion resistance. Two 15"" flat-free tires and one 10"" swivel caster provide smooth rolling and easy steering. The wide 30.1"" wheelbase adds stability when turning, while the 31.1"" handle provides additional leverage for moving trailers. This Tow Tuff dolly works with a 2"" coupler or larger. Mfrs. 1-year limited parts warranty. Max. wt. cap.: 1000 lbs. Patented dual-adjust ball moves up and down and forward and backward Ball adjusts from 18"" to 22.5"" in height Ball adjusts forward and backward in 1"" increments 1,000-lb. capacity moves a wide variety of trailers Two 15"" flat-free tires and one 10"" swivel caster Solid steel frame with hammer-tone powder-coat finish 30.1""-wide wheelbase adds stability 31.1"" handle provides additional leverage Works with a 2"" coupler or larger"