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A toolbox for a truck bed has a box with at least five walls, including a floor and four side-walls rising vertically from the floor. The box has an open top-end. Extension walls fit within the box next to each of the vertical walls of the box. The extension walls are joined together. A cover is att

A toolbox for a truck bed has a box with at least five walls, including a floor and four side-walls rising vertically from the floor. The box has an open top-end. Extension walls fit within the box next to each of the vertical walls of the box. The extension walls are joined together. A cover is attached with a hinge affixed at the top of one of the extension walls and it rotates between a closed position and an open position. The closed position prevents access to the box and the open position enables access to the storage volume in the box. The extension walls are slidably engaged to the box in extensible guide rails so that the extension walls can be moved vertically from a lowered position to an elevated position and vice versa within the box.

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1. A toolbox system comprising a pickup truck, the pickup truck comprising a truck bed and two truck side walls, the tool box system further comprising a tool box installed on the truck bed, the toolbox comprising: a box comprising five walls, the five walls comprising a floor and four side-walls ri

1. A toolbox system comprising a pickup truck, the pickup truck comprising a truck bed and two truck side walls, the tool box system further comprising a tool box installed on the truck bed, the toolbox comprising: a box comprising five walls, the five walls comprising a floor and four side-walls rising vertically from the floor, the four side-walls defining an open top-end and the box defining a storage volume;a plurality of extension walls fitting within the box, each extension wall in the plurality of extension walls is joined together so as to be located adjacent to one of the four side-walls of the box;a spring-actuated detent for each of two of the extension walls in the plurality of extension walls, each spring-actuated detent mounted to an interior surface of one extension wall in the plurality of extension walls, each spring-actuated detent configured to automatically engage into a hole defined in one of the four side-walls of the box when the extension walls are in the lowered position, and each spring-actuated detent interconnected with the other and configured to be released simultaneously;a cover atop the extension walls, the cover hingedly attached to one of the extension walls so as to rotate between a closed position and an open position, when in the closed position the cover prevents access to the box, when in the open position there is access to the storage volume, and when the extension walls are in a lower position and the cover is in the closed position, the cover extends beyond the box and over the truck side walls; anda plurality of extensible guide rails, each extensible guide rail in the plurality of extensible guide rails comprises a fixed part and a sliding part,wherein the fixed part of each extensible guide rail in the plurality of extensible guide rails is mounted vertically in a fixed position on substantially opposing side-walls of the four side-walls of the box;wherein the sliding part is attached to the extension wall that is adjacent to the extensible guide rail so that a bottom of at least one extension wall in the plurality of extension walls can be moved vertically from the lowered position to an elevated position within the box. 2. The toolbox of claim 1, further comprising a plurality of locking hinged pins that may be swiveled in place, each locking hinged pin in the plurality of locking hinged pins passing through one extension wall in the plurality of extension walls and through one of the four side-walls of the box that is adjacent to that one extension wall. 3. The toolbox of claim 1, further comprising a lift support that biases the position of the plurality of extension walls to the elevated position. 4. The toolbox of claim 1, further comprising a handle mounted to one of the extension walls in the plurality of extension walls so as to be accessible when the extension walls are in the lowered position and when the cover is in the open position and configured to permit manually lifting and lowering the plurality of extension walls.