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I am with Bill on this one. Fortunately informed by a few years as a logistics manager. For Heavy Goods Vehicles at cruising speed there are two major resistances that need power to maintain speed: Air drag and Rolling resistance. Drag is independent of weight but is typically a quarter of the effect of rolling resistance which is proportional to weight. So heavy batteries will drive up your overall power demands per tonne-km moved. Acceleration is rather a small part of a long distance trucks overall energy needs so can be ignored. Trains are a different story. Rolling resistance is negligible as steel on steel has a very low rolling coefficient, so you can pile on the heavy battery packs with little impact on performance.