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Consider this. How much does your airplane weigh when you pull 2g's? Answer: twice as much as it's own gross weight.
Therefore, the FAA allows airplanes to fly over their gross weight for ferry flights with a ferry tank installed. Why! Because the airplanes are designed to be flown over their gross weight. But. And this is a big but. Flying is limited to 1g. So it has to be a no turbulance day...until you burn off enough fuel to be below the certified gross weight.
So, how does adding wing tips increase max gross weight? Does it require a new spare? No, it doesn't. So, the airplane was designed for weights above gross. But you just have to take it easy when you do.
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