offset bushings

Several good posts on the offset bushings. Their original intent is to repair a pushed-in upper frame from a side collision. To improve caster, do not install them per package directions, follow the photos in posts here. I used just one on each UCA (cheap), as the aft bushing. I don't particularly like them because there is little rubber on one side, so seems like a future problem.

You want to move the upper ball joint aft. Imagine a line between the centers of the ball joints and project it down to the road. If the tire's "contact patch" is behind that point, you have positive caster, which is good. The tires then want to follow, like a shopping cart wheels. Negative caster is like a bad shopping cart. Another way to get more caster is to pull the lower ball joint forward, by using a shorter strut rod. The only one I know is an adjustable strut rod. Some posts here.

I disagree that one can't set toe-in very accurately with a tape measure. Try it and you will find that even a small turn on the adjusters is very apparent on the tape measure. You also see the effect by sighting along the front tires w/ a straight edge at the rears. I doubt shops with an expensive laser machine turn your adjusters finer than a 30 deg turn. That setting won't hold forever anyway. Toe-in changes greatly as the ride height changes, etc, so most important is to check and adjust it regularly, by whatever method. If you can afford yearly alignment shop work, go for it. Incorrect toe-in is the main thing that affects wandering and tire wear.