The Cherokee, being solid axle, is one of the most capable SUVs on the market, right up there with the Discovery and Range. It was not a true unibody , but what Jeep calls a uni-frame . It has two full length frame like support beam integrated into the body that runs from front to the back. It serves the same purpose as a frame, just that you can't take the body off or do a body lift. This is also what the new LR3 have.

The Liberty can go all the places an X can go. But my point is simply that it'll scrape a lot more things on the way than the X. The X on the other hand, has inferior front suspension travel and approach / depature angles. A SAS will make both perform like a Rubicon with lockers, so talking about it is pointless.