I am thinking what was just said. Put a straight edge on the main tube. Those bars are low enough that it would not take much to hit them. The lower brace is very small tube and not strong at all. Being that you are using your truck offroad. If there is clearance. Put them in upside down. They will be just as strong and effective. But it will put the main stronger bar on the bottom.
Looking at the pictures again. That is not were I would expect them to bend under power. That is exactly where I would expect them to bend if hit on something. mud, ground, driving out of a hole, ect