I've seen this one before.......
25ft away from a wall works great.....the back wall of a garage is even better...if you don't have it blocked by clutter.
At that distance you can see where your headlights are aimed and adjust one or the other. I've used this method in the past for my cars, but I've never had to adjust the alignment with the Ranger.
As the instructions with the attached URL are for a car, and go into WAAAAY to much detail and theory behind the way the alignment should be done........it's a pretty good guide to take as an example of the steps taken.