Yeah but have you seen stock KL Trailhawk's perform off-road? They can hold their own pretty well. It's actually impressive.
Some day someone will develop some dropped control arms and stuff to really allow at least a 4" lift. I can see it being possible, but i can't see anything more than that being possible without a *lot* of driveline changes needed. They do look pretty nice lifted though, especially the facelifted ones.