The wheels and tires are way too big for that XJ and have to go.
What kind of lockers?
How is the suspension setup?
How is the steering setup?
Stock shafts front/rear or aftermarket?
If the jeep truly has under a 100k on the clock then there is plenty of life left in it.
I like XJ's and have had 13 of them but I don't see this thing driving down the interstate at 70 mph unless the suspension and steering setup much better than the rest of the jeep looks.
When you check it out in person post back up and let us know what you find.