Fastway offers a tethered tow ball cover

(July 11, 2013) -- Unlike other ball covers, the Fastway tethered ball cover conveniently stays with the hitch ball while towing and is ready to use when it’s time to store the trailer. The Fastway tethered ball cover makes storing a trailer faster and easier. Two different models are available: one for a 2-inch ball, and one for a 2-5/16-inch ball.