I have a hang on stand that I'll put up as high as 20 or 25 foot.
I forgot to tell a friend of mine to not worry when hunting out of it and the wind blows. Perfectly fine with the tree swaying back and forth.
Needless to say, Mr. Bill climbed down and hunted on the ground. Being that high and the tree swaying wasn't his cup of tea.
I never measured, but the trunk of the tree was as big as a electric pole. I've never worried about it.