make sure your u bolts are tight mine did that for awhile and still does from time to time so i just keep cranking them down
I finally got around to checking them today. Using a 1/2 drive ratchet, I was able to get a minumin of 1 full turn on all of them. There was 1-2 that I actually got more out of.
Also, while checking things over, found this:
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I should probably get that fixed sooner rather than later...