What we do at the shop that works well is..
-Park the truck about 20-25' from a solid wall (try and do this on level ground)
-Turn your headlights on and now take some painters tape, and put a piece of tape on the bottom most part of the low beams cut-off. Do this on each side, and put the tape in the center of the output (you only need about a 2" piece of take or so)
-Turn your headlights off
-Wide Cornering: If you plan to use these on public roads, I like to make sure the light gets centered for each side (driver's side, centered [left and right] on driver's side low beam tape). Make the top of the wide cornering pattern right at or below the tape mark you made. This ensures you have full coverage from your wide cornering and then up to the low beams. IF you don't plan to use them on public roads, you can go a little higher if you want, but i like my wide cornering to cover the road in front of the truck
-Spots: Centered left to right, centered vertically (you may need to turn the headlights back on which makes this part easier to dial that spot pattern centered, maybe SLIGHTLY higher so that it goes upwards a tiny bit)
-Driving/Combo: Same as the spots actually. I try and keep the spot pattern dead center so that the wide cornering sits a little lower (you won't get the wide cornering portion of a driving/combo as low as a 100% wide cornering light).
That'll ensure everything works perfect.