I'm sure it wasn't the work on the rear frame it's self that caused the problem, but I'm sure Keystone will say it's the extended length and added weight that changed the balance of the unit causing undue stress in the hitch area. While it sucks I don't think you have a leg to stand on, unless you can hire a structional engineer to prove that wrong.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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