The overall load on the truck can not exceed the GVWR of the truck. So say the GVWR is 10,000 and the truck weighs 5,000. The load ON the truck can not exceed 5,000. But that is the actual load on the truck sitting still. So with a goose neck trailer that would mean that your ball weight. But make sure that you are under 26,000! The company truck and trailer by the numbers weighs in at 25,853! Now we couldn't have done that if we wtried to!