 The Mauler, frequently seen in the series, is used erroneously. The  original source states that the Mauler was an experimental  Battlemech built in the Draconis Combine, and seen far too  frequently in the possession of the Combines long time rivals in  the Federated Suns. This is presumably due to budget limitations.  The series uses only a few designs throughout the entire series.  (Mauler, Wolfhound, Centurion, Awesome and Bushwacker for the Inner  Sphere, and the Timber Wolf (Mad Cat), Mad Dog (Vulture), Hunchback  IIC and Summoner (Thor) for the Clans). See Below