They have been rated up to 400lbs by papasmurf, who uses these for his danger birds...I am ordering one within the next week from amazon.
People have reported them ripping through, but if you check your tablecloth and find any holes or thin spots, you may have to get another and use the first cloth as intended. Don't let this discourage you though, it seems like a fairly abnormal thing.
"We do not go to the green woods and crystal waters to rough it, we go to smooth it."- G. W. Sears
My forum name is Fish<><; I'm in the navy; and I hate sleeping on the ground. If I didn't need ground to walk on or measure resistance to, I think I could happily give it up.