Art,
I do not jack on the AXLE even at the "U" bolts. The manual says DO NOT JACK ON THE AXLE. You are thinking the jack tightened the "U" bolt. I am thinking 3000 pounds to 6000 pounds may have bent the axle tubing and caused the "U" bolt to come loose. You have just given me another reason not to jack on an AXLE. Thanks. Good luck and let us know what you find.
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