I had those in the craft room at our old house, not by choice, but because I took over an extra walk-in closet. The shelves held up fine, but one of the supports (they were on supports attached to the wall to make kind of a triangle with the shelf, not the kind that hang from wall-mounted rails) gave way and the shelf fell. But that one had my heaviest stuff on it and was really loaded up. The other four 6-8 foot shelves held up fine. I'd say if you distribute the weight evenly you'll probably be fine.
HTH-
__________________ If one is going to tell a lie, make it a big lie, tell it loudly and tell it often and eventually people will come to believe it. ~Josef Goebbels
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