I am really surprised this didn't kick up

This stuff is all way over my head but it brings to mind a test i read in the late 90's involving pick up trucks.They put a brick under the right front and left rear of each Ford, GM, Mopar and Toyota.At the time the Toyota was the only one with a boxed frame AND the only one they could open and close the tailgate on. None of the big three had any concerns about frame flexing. You could put a canoe on racks in the box and watch it move independently of you in the cab.Those trucks were overloaded, used and abused many times during their life and probably all fine for years i'm sure.