Generally, this is an indication of need for a better style hitch--another discussion going on in the "Lurching Trailer" thread...
Another item to check is the shocks on the truck to be sure they are good--at 40k miles, most OEMs are shot.
Joe
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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