I would suggest trying to get hold of a second-hand studio or surveyor's tripod.
One of those great, big wooden ones.
Short of an in-ground pier, nothing is quite as stable.
Even a Skywatcher, Celestron or Meade field tripod would be an excellent choice, though you might need to modify the head.
Those uber-expensive, super-light CF or Al models will jiggle and vibrate in the wind or with a good stomp on the ground.
When it comes to stability in tripods, nothing beats weight.
Which is why they use 'em in the first place.
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