All steel welded construction. 2 nos Main longitudinal members are high strength, lighter weight, Parallel flange Beam of IS2062 (or) Equivalent grade steel running along full length of the trailer. Cross members - Rolled or Folded of material IS-2062/ST-52 are positioned at suitable locations. 4/8/12 nos of twist lock shall be provided to suit 20 & 40 feet container.