I've posted about this before, so unless someone wants the whole explaination with the pics, I'll just keep it simple. The problem is where the main frame makes the bend for the tongue. There needs to be a cross member right at the bend to keep the frame from flexing at the bend. On the PJ and Loadmax and at least one other brand they put that cross member behind the bend, this alows the frame to flex at the bend and eventually to fail. I will say the PJ trailer is better than the Loadmax and I've only seen the PJ trailers fail when they are pulled behind a heavy duty truck like a 1ton dually or f450/550 or even a dump truck or such when they max out the tongue weight for the trailer. I don't have any pics of the PJ trailers I've fixed, but I do have of a loadmax that I saw at a dealer. The loadmax was only a year or so old and since they made 2 design erors they are likely to fatigue crack with even light use.
Most manufacturers that I've seen have put a heavy cross member right at that bend so I really have a hard time understanding why some don't. This is pretty basic structural engineering stuff.
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