Christopher - Something to think about. I just recently put 4 new (expensive) Michelin tires on my Lexus LS 460L. I want that thing to ride like on a cloud. I got the new tires at Discount Tires, they don't do alignment. So then I took it to another shop for the alignment.
After new tires and alignment, it had a slight pull to the right and felt sort of like I was riding on light gravel. Took it back to both places, rebalancing and realignment. Still felt the same ever after redoing both. Took it back a 3rd time (including the tire replacement time) and they finally got both resolved.
The point I am making here is, the alignment shop always gives me a before and after. At the initial alignment, the "before" condition looked kind of garbagie, the after looked great. Yet it pulled and felt gravely.
When I took it back in the 2nd time, I expected the before alignment numbers to look like the after numbers from the previous time. However, it had NO resemblance. I wanted to raise hell, how could that be? I refrained. When I took it back the 3rd time, it was the same thing, the before numbers looked nothing like the after numbers from the previous alignment. Before I said anything about it, I sat and thought about it, what it would be like to do the alignment ... in real life. Not just in my head (my head assumes perfection because things are easy, which is generally always wrong).
This is my theory, again, I don't know this for a fact. Never having done this process, I speculate about this. But ... The car is driven up on the machine and placed and set up in some manner / process. Those alignment "heads" get attached to the wheels. I speculate that my car remained out of alignment based on the person doing the alignment. I speculate that the 3rd guy doing it was just plain better at doing an alignment than the first two. And that the "before" alignments were always off the previous alignment numbers (and garbagie) because that particular guy just wasn't good at that job. With those heads being monitored by laser light some 10 to 25 feet away, there has to be some real effort on the part of the tech, to be very careful to set things up accurately.
In your case, I would imagine this is coming into play. I don't know that for a fact. Finding different results each time you bring it it could be a tech-by-tech or shop-by-shop issue. Perhaps that shop's techs weren't properly trained on how to use the Hunter equipment. I've been to the Hunter headquarters and out in their development shops. Those devices are L-E-G-I-T. It takes a skilled tech to use that stuff right. That's my take on at least a portion of the problems you're running into.
I went to that place (I don't think it was called Hunter, I'd have to look it up, I think they procured Hunter or Hunter procured them) for a job interview. It was a spectacular place. Great leadership, great engineering staff. And I would have accepted that job but ... Arkansas. It looked like a fabulous town, it was just way too far from any other family the wife and I have. What a shame. Gonna look up now what that place was...
Correction: It was Snap-On. It's been over 10 years. I don't remember exactly. However, from my memory, I think what they were telling me was that the alignment stuff they were selling was re-branded Hunter, liscensed from Hunter, as I recall. Either way, I wanted to work for Snap-On, and they made me a good offer. I just couldn't overcome the isolation from family.
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