A few weeks ago, I installed my new heavy duty solid steel track rod from DAP, and needed to adjust the wheel alignment. I already had the wheels off (changing to street tires) and the truck on jack stands, and needed to set the wheel alignment.
The only adjustment that is easily made for D1s (I don't know shit about D2s) wheel alignment is to adjust the track rod (the one behind the axle) by turning it to change the toein-toeout angle. On D1s, the angle should be 0 degrees.
So I took 2 3ft. pieces of angle iron I had laying around and clamped one to the bottom of each hub so that 1/2 the length of the angle was to the front, and half to the rear.
This made it really convenient to be on one side of the truck turning the track rod, and measuring the distance between the ends of the angle irons, until the front and back side-to-side measurements were equal. This gives a setting of 0 degrees.