A hollow shank is exactly what it sounds like, the shank is the part of the ball mount or accessory that fits into the receiver. Most 2 inch ball mounts are hollow. Some higher capacity 2 inch ball mounts are solid and others made of forged steel or solid aluminum.
A hollow ball mount puts less stress on the trailer hitch because there is less mass pushing against it. If you happen to live in the great state of Pennsylvania we have heard that you must have a solid shank ball mount like # 428 view full answer...
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