I am aware of Tashjian the company, Karl, and what is shown in regards to current crank up towers on the Tashjian website. I have messaged to Karl with no responce as of yet.
Hoping someone in the forums has the engineering data or similar for the T237 as what is on the Tashjian website for the current production crankup towers such as the LM237. The LM237 there differs primarily in that it is a self supporting tower whereas the T237 is meant to be bracketed or guyed. http://www.tashtowers.com/pdf/LM237-01.pdf