I am really surprised this didn't kick up

ir3333 said
Lots of debatable info.Flex was definately a part of engineering our vehicles.They used to say a Model A would flex through any rough road of the day and that is why their frames weren't boxed.
Think of a long piece of steel and apply weight to the centre...it will form a smooth gradual bend.Now reinforce the centre 50% and apply the weight again and you will probably break the ends off.
I don't think it will matter for the majority of us one way or the other.

Flex was engineered into model Ts and to a lesser extent on model As simply because the roads were mostly rutted dirt paths and horse trails turned into roads. In the rainy season it was like quagmire, when it dried it sucked bsdly. They needed the twist because the roads were soooo bad.

By the time our stuff was engineered the interstate highway system was built, or close to finished in what places that were unfinished. Chrysler touted their "new" unibody cars of the time 50 years ago as a design as stiff or stiffer as a traditional body on frame car with lighter weight, and less flex than traditional body on frame construction. They were all working towards a tighter and stiffer car. This was a relatively new approach to car building. Chrysler went all in. So did Ford. GM kinda tip toed around it.