I don't disagree with anything you say here. His wrong offset will cause scrubbing, just not as much as on our 190's.
Very possible. I wonder if the long vans and standard vans were designed together or separate. If GM were smart (which is certainly not for sure) they would pick a midpoint, I would think, but they may also intentionally generate some scuffing to induce the desirable understeer that is needed in the empty vans.
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