Your floor can hold a lot of weight...as long as it is spread out. You will not have a problem with 3000lbs spread over 12 square feet. I had the same question and a friend of mine talked to some engineers at his worksite and they pretty much laughed at the concept of 1500lbs going through the floor when it is spread out over 8 square feet.
I'll get a hold of the guy again and send you the standard joyce weight limits....its pretty high per square foot.
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