Abstract: A truck storage box having an access door, wherein the access door has, mounted thereon, an aerodynamic body panel of the kind used on commercial trucks and the like. The access door is hinged along a vertical hinge to open in a traditional door-like manner. The storage box can be affixed to the truck chassis between the front and rear axles of the truck. The aerodynamic body panel on the storage box can be overlapped on one end by an adjacent body panel such that access door of the storage box can be opened without interference between the two body panels. The access door can further include a step or steps which can be used by a driver for ingress and egress from the truck cab. The storage box further includes a latch and a locking mechanism to secure the access door in a closed position. A method of retrofitting a commercial truck having aerodynamic body panels with a storage box is also disclosed.