What is a "trailer" in the context of fire investigation?

In the context of fire investigation, the term "trailer" refers to the linear fire pattern set intentionally for spreading. This concept is crucial in forensic fire analysis, as investigators look for evidence of arson or intentional fire-setting techniques. A trailer is often created using flammable materials to direct the spread of fire, and it can provide important clues about the fire's origin and the actions of the individual responsible for it.

Understanding this aspect of fire behavior helps investigators reconstruct the circumstances surrounding the fire incident, making it possible to determine whether it was an accident or a deliberate act. Identifying trailers can lead to insights about the methods used in setting the fire, which can assist in both legal proceedings and preventative measures for future incidents.

The other options pertain to different aspects of fire investigation or equipment, but they do not capture the specific definition of "trailer" as it's understood in the context of fire patterns and arson investigation.