Hard to say without seeing it, but if the problem started when you changed the ball, that's a possibility. Could be just a sticky coupler, though. Have you lubricated it ever?
Standard ball sizes are 1-7/8, 2", and 2-5/16 and for tow bars the common size is the 2". 1-7/8 is too small in weight capacity and 2-5/16 is huge, for towing a mobile home or similar load.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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