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For the logical question asked: I visually inspect for cracks/abnormalities every time I get ready for track along with checking tire pressure on trailer and testing lights. I check bolt torque every quarter. I put grade 8 bolts in the empty holes when I bought it.
To me it looks like something was inherently wrong. It appears hitch assembly was bolted to bottom of frame rails and rail bottom section ripped away from side of rail. Interesting that hitch stayed mounted and did not fully rip away. I would be curious as to how everything on ball was configured. Maybe too much drop, too much tongue weight or just too many big bumps with heavy tongue or big drop. Not surprised at separation of formed rails, boxing that area would have shared load to top/sides.
As I understand it, is not uncommon on big overhang RVs towing big enclosed trailers. They make a trailer toad unit to absorb tongue weight which may be okay static but see major overload in operation depending on terrain.
It also did not really look like a new issue from large version of pics.
I'd be curious to know if it happened progressively or all at once.
Great it did not cause accident or major issue.
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