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Well, if you assume a typical 18-wheeler, 60-70,000 lbs, and truck tires
having an estimated 4x the contact area of a car tire, then there is less
than a factor of 2 in pressure between car and truck. Of course the
loads aren't really distributed evenly over all the tires, but a factor of
2-3 in pressure between truck and car then moves us back to overall force
as the culprit (if we are to blame the trucks for the damage).
Rick