Chassis Building 101. Ride Height

[kingcrunch]

Not aiming to be the smart-ass here but i think the important difference between the Big-10 chassis and a normal truck frame is the X-shaped structure in the center, that links all of the points that have some kind of force transmitted into them to eachother.
Without that, even an 11" tall lader type frame will twist like a fish...

I want to build a bolt-in X-structure like that for my projects frame.

For cars there's a lot more you can do than a roll cage (increasing the number of pinch welds, stitch-welding frame structures, adding reinforcement panels to link structures together, etc.)