Your technician will advise what kind of alignment is best for your vehicle type. Generally, a four-wheel alignment will cost more than a standard or thrust alignment.
Thrust Alignment: A thrust alignment is the most accurate alignment for vehicles without adjustable rear suspension. Only the front wheels are adjusted. Here’s how: There’s no guarantee both rear wheels are pointed straight ahead as they should be. One may be pointed exactly forward and the other slightly off. Or both their angles could be off. Since this can’t be adjusted, the front wheels are aligned as closely as possible to the thrust line, which is the average of where the two rear wheels point. This compensates enough to get a centered steering wheel.
Four-Wheel Alignment: This is done on vehicles with adjustable rear suspension, to bring all four wheels of your vehicle back into your vehicle’s original specifications. All four wheels are aligned to the center of the vehicle. First, the rear axle angles are measured and adjusted, then the front. This is the best, most accurate, manufacturer-recommended alignment for vehicles with adjustable rear suspension.