From the Life Line Emergency Vehicles website:

Reference #:4758

Model:Superliner Type I

Module Size:171″

Chassis Make:F-Series

Chassis Type:F550

Wheel:2WD

 Life Line Superliner Type I ambulance

Life Line Emergency Vehicles photo

 Life Line Superliner Type I ambulance

Life Line Emergency Vehicles photo

 Life Line Superliner Type I ambulance

Life Line Emergency Vehicles photo

thanks Martin