I agree with this statement, that bracket assembly looks like it needs something to distribute the forces and add some structural integrity.



For example, I''m sure you've noticed the underside where the bench bolts in, there are (at least) two front-rear U-bracket-type of supports under there where the seat bolts on.

It's good you had a 300 lb guy bounce on it but the NHTSB (and the insurance companies doing an after-the-fact investigation) is (are) gonna be more concerned about what happens in a severe impact and who is to blame for injuries suffered....