Aligning a semi truck can be quite simple by following A Common Man's Guide Truck Wheel Alignment. The first step is to measure and adjust toe. The toe can be measured by using two tape measures and two modified lengths of aluminum channel stock as shown below (not that greatly). Next, measure and observe tire wear. Also, inspect all mechanical suspension components for broken or worn out parts. Check the front axle for caster plates and make sure each side is congruent. Square the steering axle by measuring from a "standard" point on the frame to the axle.
Adjusting toe
Measuring and adjusting toe
Checking for caster plates
Adjusting the drive axles are just as simple. The two main adjustments for drive axles are adjusting the thrust angle and centering the axle. Start with the front drive axle by checking the thrust angle using the "string and tape measure" method shown in A Common Man's Guide Truck Wheel Alignment.
Measuring thrust angle of the front drive axle
Thrust angle shims can be found on the front of the leaf spring assembly
Truing the rear drive axle off the already trued front drive axle
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