[aerohead]

* it complicates the design, construction.
* it weakens the chassis, requiring additional reinforcement for torsional stiffness, crashworthiness.
* adding weight.
* wasting otherwise needed materials.
* if it fails-dangerous, the driver and passengers may be imperiled, with asymmetrical weight distribution, tire overloading, polar moment instability, loss of directional stability, rollover, spinal cord injury if not traumatic death.
* I don't see any upside.
* current lateral g-forces for production cars already exceed what most drivers are comfortable experiencing.