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Pickup truck benefits less from lightness because they can't get away with smaller suspension, brakes, engine since their payload and tow rating needs to remain high. None of those things can be downsized as a result of simply weighing less.
That said, hybrid/electric technology does allow the engine to be downsized, and reduces the weight penalty. Hybrid technology should have begun with pickup trucks, not with the smallest, lightest vehicle on the road.
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