I would suspect frame Flex. Next time you hitch up, watch the bottom of the "overhang" where the pin box is. It shouldn't move much at all when you lower the trailer onto the hitch. Observe it as you drive down the road, some Flex is normal and I don't recall the accepted limit, but from what you describe it sounds like maybe a broken weld.
Also, seems like I remember an issue with some years of Lippert frames, might want to check if yours was included.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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