MN State Trooper Question: I would like more information on trailer hitch ball sizes and why they have different sizes?
Answer: There are four different trailer hitch ball sizes. Each size has a different weight rating related to the trailer you are pulling. It is very important to make sure you always use the proper ball size with the trailer you are pulling. The ball size required for the trailer is stamped on the coupler of the trailer. If you use the wrong size ball, the trailer will not latch properly and could come disconnected. Once you have the ball connected to the coupler, you need to latch down and put a pin through the coupler to keep it secured.
Trailer hitch ball sizing:
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