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^^ So, a sample of one. That's not too convincing, especially without trying different loadings fore and aft, which affects pitching frequencies. To get over a bump at speed, a wheel has to store a lot of energy in its spring, which can only come from momentum of the vehicle. Low unsprung weight lets you recover more of that energy on the back of the bump. I have not studied the rolling distance factors, because nobody else has written about them. I suspect that compliance built into the system, and the differential between the axles will minimize that quite well.
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There is no excuse for a land vehicle to weigh more than its average payload.
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