So what's the big deal about lifting a vehicle? Anything can be lifted. If you base that as a vehicle being off-road capable, I guess you'll be buying a Yugo, eh?
The reason I won't lift my Xterra, or my Jeep, is that it makes them top heavy. The key is to go with as large a tire as possible while keeping the lift to a minimum.
I'll have to scan some pictures I took years ago with a film camera. They were taken at a local mud bog event. Monster vehicles got stuck in the mud while a stock looking Wrangler drove the entire length of the pit. The only other vehicles that made it were the highly modified rigs (running nitrous) with paddle tires that could get on top of the mud. Taller isn't always better.
So do you have a major lift kit on your Grand Cherokee?