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I'll happily admit mine is overkill, it's probably like you mentioned, not only able to hold up an elephant but 4 cars with it. High frequency vibrations was a problem for me, so I filled it with sand to stop it ringing like a bell. I've always thought just a solid concrete pier with reinforcing would be better because of that but duno for sure.
Bigger is better, I'm glad I made it so oversized. Besides, the difference in cost between big and small is not much compared to the overall cost of having someone weld it up and getting the thing stuck in the ground.
Roger.
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