[aerohead]

I looked at a page full of 2007 Grand Cherokee blueprints, and couldn't discern the body rake.
Typically, squareback bodies don't generate lift.
And JEEPs are heavy enough, and 'slow' enough that at 'normal' driving speeds lift would never be an issue.
Unless you have the 770-hp version. They'll be especially engineered not to 'kill' their operator.