what are trailer hitch ball sizes?
The different sizes of trailer hitch balls are 1-7/8-inch, 2-inch, 2-5/16-inch and 3-inch. 1-7/8-inch hitch balls are for light-duty trailers, 2-inch are for medium trailers, 2-5/16-inch are for heavy trailers and 3-inch are for gooseneck trailers.