A tray for mounting between walls in which the bottom and sidewalls of the tray body are formed as an integral piece using a pultrusion process. Electrical conductors may be embedded into the tray body to permit attachment and electrical coupling of lights and other electrical apparatus thereto. Slots formed in ridges which are intergrally formed on the bottom of the tray are aligned with slots formed in ribs formed integrally along an inner surface of the tray sidewalls. A tray divider is selectively securable in aligned slots in the ridges and ribs and held in place with a clip.