Fleet vehicle and cargo van are descriptions that can apply to the same vehicle. Fleet identifies an organizational arrangement for use and support. Cargo van identifies a body with an enclosed area intended primarily for goods or working equipment. A delivery company’s cargo van has both characteristics; a fleet’s passenger car has only the first.
The distinction helps separate management information from physical specifications. A fleet record may tell you who maintained a van, but it cannot establish that a particular cabinet will fit through the door. A large cargo compartment may accommodate equipment, but it says nothing about whether a company has kept service records or arranged a replacement during repairs.