Sorry to hear about your issues. The tires on these rigs should be load g from the factory but no one thinks about that until it's too late.
I don't have issues with my frame supports yet but I'm keeping my eyes on them. Hopefully your dealer can get your issues fixed up quickly
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2016 North Point 377 RLBH, with a few mods
2014 Ford F350 Platinum, CC, 6.7PSD, DRW, air bags, Curt Q25 hitch