Alignment of the front wheels is essential if your truck is to go, stop and turn as designed. Alignment can be altered by collision, overloading, poor repair or bent components.
If your vehicle is exhibiting bizarre handling and/or poor road manners, the first place to look is the tires. Although the tires may wear as a result of an alignment problem, worn or poorly inflated tires can make you chase alignment problems which don't exist.
Once you have eliminated all other causes, unload everything from the rear of the Pick-up or Montero except the spare tire, set the tire pressures to the correct level and take the vehicle to a reputable alignment facility. Since the alignment settings are measured in very small increments, it is almost impossible for the home mechanic to accurately determine the settings. The explanations that follow will help you understand the three dimensions of alignment: caster, camber and toe.