Abstract: A movable modular truck toolbox mounting lift system for lifting and repositioning a modular accessory (e.g., toolbox, container, cooler, platform) of a vehicle (e.g., truck, UTV) to enable access to the modular accessory without requiring an entry into the vehicle, a vehicle storage area, or a truck bed. The system has driver side and passenger side support plates pivotably connected to a pair of arms, which are in turn pivotably connected to each other to and upon movement (extension) of one arm pair, the modular assembly transits up and backward within the storage area. The system may be operated via actuators and/or motors to rotate the arms and lift/reposition the modular accessory. The modular accessory may be a toolbox, cabinetry toolbox, or a tray for receiving a plurality of modular accessories. A method of installing and using the system to lift and reposition a modular accessory in a vehicle.