A portable workstation which includes a hand truck; a toolbox which can be detached from the hand truck, and a tray which can be detached from an upper portion of the hand truck. The hand truck has a mass and angular relation to the toolbox configured to stably oppose a torque created by a weight of the tray and a load supported by the tray if the toolbox is detached from the hand truck portion. The toolbox includes a top cover which is reversible to convert the toolbox into a seat.