Those cups are usually rated at about 250lbs each but can handle a bit more, I've stuck one to a wall and done chinups.
Funny thing though, if you stick one to the side of a huge display case and then have a 280 lb guy lean back and try to drag it a couple feet it may fail. Luckily the wall a couple of feet behind me was not significantly damaged. I don't really recall the event but apparently it was spectacular.
Just what I needed, another story with "when I regained consciousness" in the middle of it.
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