It looks like the term "Truckers Friend" applys to a fire department truckman's tool. In larger , especially career, departments, apparatus and duties are divided into two primary catagories:
Engine companies: Responsible for operating a pump, humping hose and putting "the wet stuff on the red stuff".
Truck companies: Entry, search, rescue, ventilation and pulling ceilings and walls during the mop-up phase. "Truckees" are the main tool users and are equipped with various types of axes, pike poles, crow bars and other , more specialized hand and power tools, as well as ladders.
Both types of companies work as a team under direction of the incident commander.