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What I've found is that the weight capacity ratings can help determine relative stability. For example, my old Bogen legs could support 11 lbs. That's enough to support a large DSLR and a medium lens. In theory.
Yes, it supports it. It doesn't support it well, especially when the center post is extended.
My Benro carbon-fiber has a weight rating of 25 lbs. I've never put more than half that amount on it. It's rock solid, even with the center post slightly extended.