Final answer:
A Brush company is responsible for protecting structures in the wildland/urban interface, equipped with specialized vehicles and tools to fight wildfires.
Step-by-step explanation:
The type of company that primarily protects structures in the wildland/urban interface is a Brush company. Brush companies are specialized units designed to fight wildfires and are equipped with vehicles that can navigate through rugged terrain, which is often found in the wildland/urban interface areas. They have the necessary tools and training required to handle the complex dynamics of wildfires, such as controlling the spread of flames, establishing containment lines, and protecting structures that are threatened by the spread of fire.