Tie down straps connected to cinder blocks. some leg designs are more stable than others. If you have yours on grass/dirt you could pound some 2x2's or metal fence "posts" in on either side and connect them with a strap. 2 per side connected would be pretty strong i'd think? look about $5 each from home depot
The problem with just putting things on top is that top bars tend to be top heavy anyway.. so adding weight to the top may not work.. that's why i think strapping them down to heavy things low would work well.
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