The vehicle roof cargo carrying system includes front and rear subsystems affixed to the front and rear of the vehicle roof. Each subsystem includes an extrusion guide rail slidably engaging a sliding block. Each sliding block includes a translational actuator for side-to-side movement across the vehicle roof, and an elevation mechanism. The elevation mechanism includes a primary arm and secondary arm, wherein the primary arm first end pivotably attached to the sliding block and the primary arm second end hingeably attach to a first end of a secondary arm. A second end of the secondary arm is attached to a cargo-platform bracket. The primary and secondary arms are reversibly moveable from a folded position wherein the secondary arm is nested within the primary arm, and an unfolded position wherein the secondary arm extends from the primary arm. The primary arm pivots relative to the sliding blocks.