This security deck enclosure creates a large and lockable storage area completely protected on all sides. It works in conjunction with the vehicle rear door and lock. The lid easily hinges open and is secured shut using an innovative latching system. The lid and front can be easily removed without tools so larger items can be transported when required. The unique lid design is constructed from structural welded steel which incorporates a large weight bearing tray for organizing and transporting items on top. There are also two large trays on each side above the wheel well for addition storage and organization. Any items stowed on top of the enclosure must also be securely fastened to the vehicle. The entire Tuffy deck enclosure is constructed using welded 16 gauge steel, heavy duty fasteners, and finished with a durable textured powder coating.