Mine are held on with a bolt/nut through the pinch weld, and a #10 self taper into the back of the rocker box above that. Yes, they flex. I was going to run a single diagonal brace from the lower mounting bolt, upwards towards the frame rail (landing on whatever body protrusion was convenient) but just never made it a priority. That being said, I'm creeping up on 240lbs and they haven't failed me yet (3-4 years now.) I did set the van down on the passenger side rear step (I'm used to a bit better breakover angle... oops!) and tweaked it a bit, but it didn't pull off, nor did it break.
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