A hinge assembly for moving a tailgate about a hinge axis. The hinge assembly includes a first hinge part and a second hinge part for mating with the first hinge part. The second hinge part may be moved to a release position for releasing from the first hinge part, and a lock is provided for locking the second hinge part in the release position. A tailgate including the hinge assembly is also disclosed, which may also be provided with a powered raising and lowering capability. A related method is also disclosed.