We may have some parts mislabeling here in this thread.
Hitch -- The part that bolts to your tow vehicle.
Receiver -- That part of the hitch into which the ball mount is inserted, with a square hole usually 1 1/4" or 2".
Ball Mount -- aka Stinger; the bar on which the ball is mounted, the other end of which goes into the receiver.
Hitch Pin -- A pin, which may or may not have a lock, which goes through the ball mount and receiver to secure the mount in the receiver.
Ball -- The ball on a shaft which is bolted onto the ball mount.
Coupler -- The device on the trailer frame, bolted or welded, which clamps on the ball and is usually adjustable for a relatively tight fit (Look on the underside for the adjustment nut).
The rattle we are concerned about here is between the ball mount, the receiver and the hitch pin, which do not always have a tight fit (If the fit was too tight, the components would be stuck together from corrosion).
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