The point he is making is that you have only about 1.25 sq inches (assuming its .125 x 6(4x2 patch) as opposed to the surface area of part where the main hoop connects which would be 8 sq inches. You load the main hoop and it would act like a lever arm on the frame and deform. To reduce that you could add another plate underneath where the bend comes down from the hoop and that would slow deformation of the mounting plate.
If you got me some measurements from that picture I could do a few statics calculations and give you a basic idea of how forces would act on it in a collision.
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James F.
1974 Camaro Z28
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