I've used the 12 ton with success but wouldn't use it on a cage or anything meant to save your life. ![My Two Cents :twocents:](https://board.marlincrawler.com/Smileys/marlin/twocents.gif)
This is pretty much the idea I gathered with the searching I have done on this subject. Also, I would not use pipe for a roll cage, I would use tube. Tube is meant to be structural, pipe is meant to carry liquids/gases.