A fire engine, or pumper, carries water, hose, tools, and is primarily used in pumping water at fires. It can carry ladders, but they are set up by fire fighters, not attached to the vehicle.
A fire truck is equipped with a large ladder that extends from the truck but cannot be removed. The most common length of these ladders are from 75 to 100 feet. These vehicles traditionally do not carry water or have a pump.