not to mention driving an XJ on something bigger than 35s on the street will suck. (asides from cool factor)
you might want to look at a trailer to tow it with, and then a tow rig, but a big jeep is heavy, so you should look at a diesel or something; then get a small fuel efficient car for daily driving because the diesel is a gas hog.
jeeze, axle upgrades add up fast.