Are a ball hitch and coupler the same size?

A ball hitch and a coupler are not necessarily the same size; they are designed to work together but come in different sizes. The ball hitch is the spherical component attached to the towing vehicle, while the coupler is the part that connects to the hitch ball on the trailer. It's crucial to match the sizes of the ball hitch (usually measured in diameter) and the coupler for safe towing. Common sizes for ball hitches include 1-7/8 inches, 2 inches, and 2-5/16 inches.