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More weight in a one vehicle accident means there is more momentum to dissipate. If it takes the same amount of time to stop, then a heavier vehicle will have far higher forces. Hitting a "stationary" object in a lighter vehicle is better than in a heavier vehicle, all else being equal.
Of course, the design of any vehicle is far more important that it's weight. If weight was the only thing that mattered, then why aren't we making cars out of lead?
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