Different types of fleets viewed lightweight products differently, especially as it might affect payload. If a fleet typically cubes out before it weighs out, the value of lightweight components is not as high as it is for a fleet that may be able to add more freight dollars for every trip. Lightweight components are getting more important. Due to EPA equipment, tractors have added 1,000 lbs. Many loads have already lost payload, or close to it, said a private food hauler.