I had the stuck ball problem after I changed from a Jeep to Suburban tow vehicle.
My Reese hitch has a spacer "stud" between the part that goes into the tow vehicle and the part that the hitch screws into. This already had a couple of the supplied washers under it. I added one more washer under the stud and since then the hitch comes off and on much easier. The spacers change the angle of the ball and how it fits into the trailer.
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