I agree. Not a tire store or a chain like Midas. Either a dealer or a good independent garage that someone you know has used. All alignments aren't equal,either. I hired an alignment "tech" who had worked at a local tire store for years and supposedly knew his stuff, he was certainly fast. The problem was that if he saw everything "in the green"- meaning within the allowable range- he'd leave it there. A real tech who had also done alignments insisted everything be set to the preferred spec, he told me he could set the camber and toe so that they'd both be "green" and the tires would be worn out in a month. I would also ask for a before and after printout.
I have to constantly explain this and that WinToe will f**k you every time to the guys I work with. I am the only one in the shop who uses the bar graphs to set toe and not WinToe and I am also the only one who isn't brining most of their alignments back in two or three times before they go down the road straight.
None of them seem to understand how to use the bar graphs to set toe and I'm like "Guys, this isn't that hard, its exactly the same except you can see both sides at the same time and you know if something changed".
The one guy who is young and inexperienced, but he just doesn't get alignments and has frequent issues with things not tracking straight. I think I finally got it through to him the other week when he brought one back in again. He had it back up on the machine and had it all set up and couldn't figure out why it wasn't straight since everything was green. He had the wheel straight ahead and .2* steer ahead, but WinToe said it was good.
I explained what the graphs actually meant, and what he was looking at on that main screen. I told him that green "is good" in that a green bar means that corner shouldn't wear a tire, but having the car track straight with the wheel level is more about balancing the sides than about having everything green.
I can set up a front end to go straight down the road and not wear tires with the steering wheel turned 90* in either direction. I can also set it up to have the wheel perfectly level, not have it pull a hair in either direction (road crown permitting) and wear a brand new set of tires to the cords in 500 miles. Just keep the caster and cross caster in spec and keep the camber and toe balanced.
The only time I don't screw with camber or caster when they are out or borderline is if there is no specified adjustments. It always means something is worn or tweaked and it is better to fix it properly than try to band-aid the problem by moving something else. My experience with that is that you almost always introduce some other issue that wasn't there before, even if you get the numbers in spec.