Chemically active colloidal particles suspended in a liquid can move by, e.g., self-diffusiophoresis by generating solute gradients through chemical reactions taking place on parts of their surfaces. Thus, they have the potential of acting as carriers at the microscale. The subtleties of such carrier cargo system are emphasized via a simple model: a spherical particle with its whole surface being active (and thus motionless when isolated) connected by a thin rigid rod to a chemically inert cargo spherical particle. We show that the direction of the motion as well as the velocity of this carrier cargo system can be controlled by the surface properties of the cargo.