frame flex with anti sway bar

69 Avion wrote:
The 2015 Ford F-150 saved about 700# by going to aluminum. It has been reported that the Super Duty 2017 models with aluminum bodies will only save about 350# because the remaining weight will be added to box the truck frame. ...

This made me think of my '04 Dodge 3500 which has a bumper to bumper box frame. I think Dodge saved weigh by making the body out of exceptionally thin steel. You can lean against a front fender and dent it.