Just guessing, but it could be underlying frame flex. Best to check it out by having the dealer hook up a tow vehicle while you watch the bulge to see if it flexes. Would help to have someone inside looking for flexing and listening for crackling sounds at the front, too.
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2016 Montana 3711FL
2005 Ford F350, 6.0 diesel, short bed
Demco Hitchiker Auto Slide hitch
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