Originally Posted by 52 Merc
From 20 feet back on a level surface, headlights on low beam should shine on the garage door level with the lamps. Dave's trick above would be fine if both vehicles had similar height headlamps. If you're adjusting a Miata and comparing with at 4x4 pickup, you could have issues.
LOL..actually it has worked ok with different height vehicles for me, putting the headlights level on a high truck just ends up blinding the guy in the car ahead of you. Setting them to match a "normal" car puts the light in front of you on the road and not in someone's rear view mirror..or up in the trees as I had at one time. I have not had anything with the headlights so low that they were an issue, generally they are pretty high even with a lowered vehicle.