The ball size id 2 5/16". Just as important as the diameter of the ball is the weight rating for the ball. Be sure you buy a ball with a weight rating at least equal to the GVW of your trailer. Better yet, buy the strongest ball you can find. Eliminate all of the "weakest links" you can on initial purchase. It is much more expensive to buy a 7500 pound ball for your hitch so you can tow a 5000 pound trailer, then in 2 years, you decide to buy a 9000 pound trailer and your ball is under-rated.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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