From lifelineambulance.com:

Reference #: 4564
Model: Superliner Type I
Dealer: Sentinel Emergency Solutions
Module Size: 171″
Headroom: 74″
Chassis Make: F-Series
Chassis Type: F550
Wheel: 2WD
Air Ride: Liquid Spring
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