String method is tried and true, cheap, but a bid of a hassle to setup
You might be interested in this (ease of use on multi cars, compact, and accurate *enough*). Sensor in phones are pretty dram accurate these days.
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Gyraline: The DIY Wheel Alignment Solution
Gyraline is an app and tool kit that allows anybody to do an extremely accurate four wheel alignment at homegyraline.com
Yeah, I have looked couple youtube videos about gyraline and was considering about it.
But the I tought that I'm not going to do that many times aligments, that it't easier to stick with ol'skool.