jack your A at a corner with and without connectors...its scary how they flex. bolt ins,
..I agree,that was the test used with Ford,Dodge,Gm and Toyota 4 x4 trucks in the late 80's
or early 90's (can't remember) where they found with one corner on a concrete block the
Toyota was the only one that they could open and close the tailgate on.
These vehicles have some "flex" engineered into them
Sub frame connectors will add some stiffness...i've just always wondered if it was worthwhile
for a street car...Those 4 x 4 domestics are probably still driving o.k.
as for torque boxes or trusses,i've seen stud walls twist and fold under their own weight like an
accordion.Scab 2 corners and they are almost rock solid.