So, of course, from the factory they are aimed correctly (we hope)..... but over the years things happen..... old shocks caused the front end to dip, so I raised them, then replaced the front shocks and had to lower them, etc.... Then I had bumper damage and had to adjust them so they were level again, etc working on replacing the bumper, etc.... I have used a brick wall to get them level, I have also parked behind another car about 12 feet way and checked the level against a real car and not a wall.... The thing is our head lights have a up and down adjustment and a left and right adjustment. What is the best way to get them lined up correctly again? I have found that on really foggy days you can check them better because you can see the core (spot) in the center of the beam better and where they are directed.