After watching that I bet I can weld one up on a rainy day. Good thick flat stock and a 4 foot piece of all-thread with some grade 8 nuts welded at the top and bottom of the tube. I wouldn't need it that "tall" as I don't do anything thicker than a standard tractor tire width.
I just bought some more welding rod today. Wonder if it will rain tomorrow?
If I do one I will post pics.