While I honestly haven't put anything huge on mine, here's another vote for a Ries tripod/head. I have an old A-series set of legs and head, and I swear the thing just laughs at my 8x10. I can sit on it and it barely even flexes (and have done so several times to prove the point). If it can hold 150+ lbs of wobbly flesh, it should be fine with any camera. And the spring-loaded mounting screw does make all the difference in the world.
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