It should be a bit of a win/win/win - the seller gets more than trade value, plus the sales tax benefit - you get a 3rd party price - the dealer gets a guaranteed sale (but probably less profit).
So, the seller is really benefiting the most and should be overly accommodating and cover any additional expenses - the dealer is really doing them a favor and really would only do it to close the sale (on both the new car, and a used one).
As the buyer, you would be largely indifferent, unless the dealer can offer CPO at a reasonable price.
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