I'm not sure if I'm understanding you, but they are welded all the way around on all 4 sides with a continuous bead and are very solid. I've hit them hard enough to rattle my teeth and they don't move at all. Much more rugged than anything you can buy. The braces tie it back to the frame rails. It stiffened the unibody up as well.
I'm not worried about them going anywhere.
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