[Christ]

Regarding Jeeps and other high-clearance vehicles:

I'd have to say the Cg is more of a problem than aerodynamic lift. As hermie says, mass and inertia still apply... if your suspension doesn't counteract inertia properly during braking, turning, etc, you're going to topple.

Of course, there is no way to compensate for all possible situations, so the automakers tend to build for "worst case scenario" within reasonable specifications.

(That's to say that worst case scenario could really just be flying off a cliff or something, which they're not going to tune the suspension to compensate for your 4,000 foot drop, ya know?)