Mezzanine capacity?

If I had to guess where it would fail first if you just kept adding weight until failure, I'd guess it would fail at the screws holding the 2x6s to the walls. To be on the safe side, you could add a some large nails there (better under shear load than screws). If you wanted to be extra paranoid, you could run a couple of 2x4s down from the 2x6 to the floor to help transfer the load to the slab. If you do that as a retrofit, make sure they are in there really tight and attached firmly to the wall so they can't buckle.

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