There are four types of positions for medium truck tires. They are: all-position, drive, trailer, and steer.
All-position tires can be used on the axle that powers the truck as well as all other axles. Drive tires are designed for use on the axle that powers the truck. Trailer tires are designed for use on trailers being pulled by the truck. Steer tires are designed for use on the front axle of the truck that steers it.