First off thanks for any help you can provide me. We are in the process of putting in some tether tracks for 24/7 testing on some of our vehicles. I am having trouble determining the size of footer I need to support the necessary load being put on the pole. I have done some quick calculations and I am getting that I need roughly a 6' diameter footer, 9' deep. The footer will not extend past ground level. The pole is 18" in diameter with a wall thickness of 2" and will, I assume, rest at the bottom of the footer and stand roughly 4' out of the ground. The force that will be pulling on this pole is 3500lbs at the top pivot. My calculation included a safety factor of 6500lbs for a total of 10klbs. Can anyone verify these calculations or help me
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