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I have a Pro Tools HD also. Put studs in the garage floor. Manually bent my whole car. Lots of bars got redone. Never had any issues as far as fatigue or not enough strength. I think that hydraulics are over rated, unless you plan on doing lots of cars. There is lots of good ideas on youtube for knowing how much material is required in any given bend. I have several bends made marked in increments. Makes measuring much easier. Made up a little clamp to mount an inclinometer on it to keep the tubing level. A high quality tubing notcher will be your best friend.
About the bending, I agree, manual works fine doing 4130 .085. But I bent a piece of DOM 1-5/8 .120 wall and thought I would have a hernia, that sucker was tough. I was using the bar they sent, maybe twice that length would have worked better, I just didn't have room on my bench to use a bigger bar. Using a longer bar probably could bend the 4130 with one hand.
Where ever you mount it make something to press you foot against for leverage, just standing on the floor doesn't work.
