Bill Proft
Specifying a new rescue apparatus can be a daunting task, given that there are few common defining features.
Some refer to them as "heavy rescues," while others call them "squads." Still others use names that capture the main purpose of the vehicle such as "air and light," "hazmat," or "fireground support" vehicles. The National Fire Protection Association (NFPA) lumps them all under the heading of "special service fire apparatus." Recognizing the importance and complexity of these apparatus, the Fire Apparatus Manufacturers' Association (FAMA) has an apparatus body technical committee dedicated, in part, to the special aspects of these apparatus. Drawing on the expertise of this committee, this article will provide some items to consider when specifying your next rescue apparatus.
Consider End Use and Purpose
Before settling on a specific size and type of rescue, give proper consideration to how it will be used. Identify how many firefighters will be on board. Will the vehicle be used for rehab while on scene? What equipment and capabilities are necessary, such as hydraulic tools, breathing air, or perhaps a water tank and pump? With these items identified, it becomes easier to decide on a general type and size of rescue truck. Give some thought to the types of calls your department is typically involved with, and consider those calls you might have based on your community, local industry, and geography. Motor vehicle accidents, fireground support, below-grade rescue, hazmat, and water and ice rescue are all possibilities. From this, develop a list of tools, equipment, and capabilities that will be necessary on your new vehicle.
Chassis
It is very easy to get stuck thinking that you "need" a specific type of body or chassis and then proceed to specify and purchase just that. The reason behind giving thought and consideration to the end use and purpose of the vehicle is to help guide everyone on the correct vehicle. The decisions for the type and size of chassis and body should not be independent activities. The two must work in concert, and one certainly affects the other. Obviously, custom cabs and chassis allow for great amounts of flexibility with a commensurate price tag. They can carry anywhere from two to 10 firefighters, have many available roof heights, often provide a shorter wheelbase because of the "cab over" design, and ultimately provide many unique storage possibilities. Commercial cabs and chassis are solid products, but most of the customization has to be accomplished at the body builder's facility rather than at the chassis manufacturer's plant. They have limited numbers of options compared to the custom products, but the price tag is typically much lower.
Consider the overall size of the vehicle based on maneuverability and the amount of space within your fire station. A vehicle that has all of the correct equipment but is too tall, is too long, or cannot negotiate turns on your community streets will serve no useful purpose. So, pick a chassis that meets the needs of your firefighting crew and allows for sufficient body storage space.
I have heard many people say that they "need" a tandem rear axle because of the length of their vehicle. That is absolutely not true. Tandem axles provide for greater weight-carrying capability and, therefore, if a vehicle that meets your requirements can be manufactured with a single rear axle, go with that. Although a tandem axle plays well with the "macho factor," it also adds cost (twice as many wheels, axles, and tires), is not as easy to maneuver, and causes more tire scrub and wear. However, if your requirements dictate a tandem axle vehicle, consider an air ride suspension. It provides a bit of a softer ride that benefits the firefighters, the vehicle, and the equipme