From my personal experience, the weak point is the top rail. I'd use a more sturdy top rail if I was looking to add weight capacity before I'd upgrade the legs. It obviously wont hurt anything to add more sturdy legs, but I'd guess the top rail would bend before the legs fail (assuming you are using the standard chain link fence top rail most use on the TDS). With a more sturdy top rail I'd guess I could safely get 350-400 lbs. on my stand as long as there wasn't a lot of swinging around, etc.
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