A system for using trading cards interactively through an electronic network, such as the Internet, combines uniquely identified trading cards with specially designed electronic services. In particular, it relates to a cover for a truck having a material carrying container, such as a tipper truck. Additionally, the present invention is a method for creating a signature of the substrate by selecting a substrate from the facility process line, receiving external sensor data associated with the substrate from a plurality of equipment-types, and integrating the external sensor data associated with the substrate to create the signature of the substrate. The light emitting chip is formed on a surface of the driving board to generate light toward the side surface of the light guiding plate. Additionally, the use of spacer blocks creates a solid stilt assembly, which eliminates the safety hazard of sudden catastrophic drops in height from failure of on-the-fly height adjustment mechanisms.