Has certainly happened. Usually it's the frame and is referred to as frame flex. Haven't heard of it on any of the newer larger framed rigs and while it comes up here from time to time, based on the number of rigs out there and the miles put on them it does seem to be rare.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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