That is cool, and thanks.
You know what - we are both right. The tire tread is most definitely handed, ie, the diagonal groove on one side points up & right, and on the other, points down & left, which indicates a directional tread. However, and this is a key however, the Aliens APC as depicted in the stills provided above, show that there is only 1 pattern (direction), and its used on both sides of the movie prop.