I use these sometimes. They are much more solid than a photographic tripod of the same price. You'll need to spend around $400-600 on a photo tripod to get something as strong. They have sharp feet and most rigid when the points can be pushed into soft ground.
You can buy an adaptor but it is easy to make one in a few minutes.
You can make one that works perfectly well from a piece of 3/8" whitworth threaded rod or a long 3/8"W screw threaded full length, a 3/8" steel washer, and a small piece of hardwood with a 3/8" hole.
See drawing (not to scale).
Joe
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