AutoMax II® is a fully integrated, two-unit railcar design with unmatched security. The sides are made of 11-gauge sheet steel. Tight-sealing composite doors have lockable bars and deck access ladders are hidden inside the doors to prevent roof access. Other quality features include a two-unit, articulated design for a smoother ride and a wider interior with door-edge protection.
Please see the article by William C. Vantuono, "Volkswagen, versatility —AutoMax makes the grade in Mexico." in the February 2011 edition of Railway Age.