I would not put tires on it. Let the buyer determine what he is willing to overlook. I laugh at those who have set rules about tires only to have them fail early from lack of use, environment, underinflating, or road hazards.
What sells a class A is a low price for that given year/brand/condition. Only a very small percentage of buyers are willing to pay a premium for way above average condition. At that age most banks will not loan money, so the buyer will have to cough up their own cash, or pay personal loan interest rates.