This is what happens when you have too much tongue weight...

I'm beginning to believe this is a result of modifications the owner is doing. for a 350 and a 450 to fail apparently in the exact same way... Perhaps he's doing something to the frame to accomodate the hitch and it is weakening the frame and allowing it to bend in the same spot. The lengthened tongue on the trailer looks like a custom job/shade tree engineering job.

I'd think he would have learned his lesson after the first one! The frame on my 250 is way weaker than the 450, and mine hasn't bent even one time. ;)