It works, but you definitely need to coat them properly. Used ones are usually pretty scratched up. If you bury two or more, you should take advantage of the bridge fittings that lock them securely together. The thing is, they are only designed to take weight on the corners. The corners can take a crazy amount of weight. The tops are corrugated steel, but I don’t know off hand how much weight they are designed to take. I jump around on them all the time, and there is no sagging or denting involved. It isn’t like a car roof or anything like that. I guess if you had one buried under six feet of earth, you would not want to be driving a bulldozer over it. I always wanted to leave about six inches around one, put some rebar in, and pour concrete over it.
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