I absolutely do not understand the math on this, but it does make sense intuitively.
https://docs.vention.io/docs/designing-with-t-slot-aluminum-extrusions
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@aaronpk That should say “shear force” (on the bolts) rather than friction for the first diagram. The bolts and plates in the second configuration are merely holding the top beam in place so the vertical beams can carry the load. Much stronger.