The local "true FEA shops" only charge $25 for a XJ, you can only set the toe and only adjust caster slightly. If a shop trys to charge you for a 4 wheel alignment on a XJ then they are crooks, walk out the door and go somewhere else.
I do my own garage alignments with 2 sticks bungied to the wheels and a tape measure.
Set the track bar first to center the axle, set the toe second, and then adjust the steering wheel center. It only takes a few min. with a helper. My 7 year old son helps me.
I set my toe-in at 1/16 of a inch, I adjust camber if I need to with a angle finder or just "how it feels" going down the road. I measure the axle center by measuring from the frame-out to the outer lugs on the tire, I try to get that within a 1/8 inch.