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Originally Posted by cody
I absolutely believe everything you wrote there, but you still haven't offered any evidence that a non-hinged STB does a better job at preventing the chassis from acting as a spring. I know it seems like it would to a certain extent, but any tiny amount of flex in the bar is going to negate the "stiffness" your depending on to hold the chassis "square". However latteral forces aren't really affected much at all by this flex.
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It's pretty simple; pinned joints can't resist moments (torques), but bolted/preloaded and welded joints can.
To keep with your square box analogy, if you have 4 pinned joints at each corner of the box, it will fall down if you push on the side of the box. If the 4 corners have rigid joints instead, it will stay standing if you push on the side of the box. I'll have to refer you to a statics textbook to get much more detailed than that.