John, Has your friend ever bent 2" .120 DOM tube with that bender? The plate thickness in the picture makes me suspect. The ProBender model above is built with with 5/8" plate specifically to use a 2" die. They don't recommend using the 2" die in the 1/2" plate model. I totally agree with you on 2" for roll cages. Besides the strength factor the tube size just looks right to me on a 40.
John,
I talked to both my friend and the folks at Pro-Tools. Both said 2.0 no problem.
The HMP200 is made of thinner metal but if you consider how short the lengths of metal are there is no lack of strength given that there is less leverage on a shorter span a longer span would need to be thicker.