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Um, math check on aisle three. Top to bottom of a 16" rim is just under 1/32nd at a tenth.
Another barrier to doing it on the garage floor is that jacking the car up and down to make adjustments will tend to bind up the suspension - preloading a-arm bushings. You can walk most of it out of there, but those roller plates on alignment racks are there for a reason. I've tried toe measurements and found that this alone made it difficult to get repeatable results. Alignment shop said I got within 0.2 degrees, but I felt I was further off than that based on difficulty repeating measurements. If you're multiple degrees out, just dropped your truck, or replaced suspension parts, you can get close enough to get to the alignment shop. However, long, term, I think it's worthwhile to pay the guy with the lasers.
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