Duplex D450 Defender

Duplex introduced the D450 chassis in the early 1980s as a replacement for the D400. It received the name Defender. It came standard with a 5 man aluminum canopy cab, a 4 door fully enclosed cab seating up to 8 firefighters was an option. In 1991 the enclosed cab became standard to comply with the new NFPA requirements.

The D450 was a 3 axle chassis intended for aerial ladder trucks and other large apparatus. Simon Duplex discontinued the chassis in the mid 1990s.