The price of the four-wheel locator is about 2W.

Recommend several brands:

Best four-wheel aligner, one-four four-wheel aligner YC-80, HUNTER tire balancer DSP9200, one-four tire balancer U- 100.

Need to study and train, but also need to consider about 2000 tire unloader.

If you study, it is recommended to join a brand chain (Goodyear, Michelin and so on), and the manufacturer will be responsible for the training all the time.