In most instances, school bus manufacturers are second stage manufacturers; however, a few school buses (typically those of Type D configuration) utilize a body and chassis produced by a single manufacturer.
The North American school bus industry produces buses in four different body configurations, listed below:
typically 16-36 typically 30-36 typically 36-78 typically 36-90 Type B (formerly) Type C Type D (formerly) Type C Type D Type C Type D Lancaster, California (Manufacturing / Assembly) Type B Type D Porterville, California (Assembly) 1985 2007