you can easily align a zj if you can read a tape measurer and loosen 4 nuts
Did that a while back after i replaced the LCA's but what i did was used the rim edge to make the measurement, im my case the toe was positive 3/8th of an inch.
Between the time i replaced the bushings and to when i was able to do the toe alignment i had to take a trip out of town, and i have to say what a squirmy ride!!! there was no road feel to the wheel as it felt disconnected and free turning with little or no resistance for 1/4 of a turn either way, the jeep didn't know which way it wanted to go and i was hanging on for dear life!!!.
When i got home i corrected it to 1/4 of an inch gave it a test spin and it still didn't feel right, so i ultimately adjusted it to a little less then 1/16th of an inch each wheel (total of a hair shy of 1/8th of an inch) and then is felt stable aside from the drift i have now.
The procedure i used was to be on a level or close to level as possible surface with a good 5 to 10 feet of space in front and back of the Jeep, this will be self explanatory as you read along. The method i used to measure and adjust the toe was to use the lower inboard part of front rims in an imaginary line parallel with the level surface i was on but low enough to not have the tape measure interfere with any suspension or steering components above, use a pencil crayon, blood off of your smashed knuckles from slipping on the wrench the other day, anything to make a temporary mark on the rim lip for a height reference!!!.
Then take your tape and stretch it across the rear side reference mark on the front rim, butt one end of the tape on the rim edge and then take a measurement on the other side using your thumb nail to point to the rim edge and measurement on the tape. make a mental note of the measurement and repeat the process on the front side reference mark on the rim, note the difference in measurements and calculate either 3/16th or 1/8th of an inch difference, loosen and rotate your tie rod clamp to adjust your toe, re-tighten the clamp then drive the vehicle backwards about 5 feet then forwards 5 or more feet, shut the engine off set your parking brake and reconfirm your measurements. Readjust and repeat the procedures if necessary. then confirm your steering wheel is straight on with your wheels, if not loosen the drag link clamp and adjust accordingly.
Fairly straight forward procedure and saves a bit of $$$ if you don't want to have a "professional" alignment done.
The only time you would want a 4 wheel alignment on your ZJ done is if you have a dealer installed cam bolt service kit on the rear axle side of the UCA's to adjust the thrust angle, otherwise its a 2 wheel alignment!.