1st time using Cat Scales, need help analyzing results

Anyone who thinks that the gross weight a vehicle is designed for does not include all components, should have seen what happened when my buddy stuck a dually rear axle assembly under the back of his F-150. He started experiencing failures including transmission damage and frame breakage. He had plenty of axle rating. The manufacturers would love to build one platform and simply vary the rear axle assemblies to suit the buyer's needs.