A process for producing cured rubber is disclosed wherein the process comprises:A) mixing rubber, carbon black, and azodicarbonamide without other curative ingredients;B) adding the remaining curative ingredients in one or more subsequent mixing steps; and thenC) curing the rubber;whereby a cured rubber having improved hysteresis is obtained. The cargo area assembly also includes extendible side wall portions. A detecting unit detects pitch of the vehicle. An action unit coupled to the classification unit performs appropriate actions based on the classified, filtered and prioritized microblog updates. Use of such a glazing insert adds insulation and light diffusion to the glazing system.