Our Expedition does the same thing, and friends of ours with both a Discovery and an Excursion do the same thing. This occurs when the air bags discharge and the coach body settles on the chassis frame. I suspect that is also true with yours.
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Jim and Lynda, (Sophie, Jake, attack trained killer Shi-Tzus :-))
2003 Fleetwood Expedition 38N 2005 Saturn Vue
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