In 1992 Simon-Duplex introduced the D9100 Signature chassis. It had an aluminum 4 door enclosed cab capable of seating up to 12 firefighters. An optional raised roof over the rear compartment was available. The entire cab tilted to provide access to the engine compartment.
The 9100 was a 2 axle chassis intended for pumpers and similar sized apparatus. It was available until Simon Duplex went out of business in the late 1990s.