Because I believe in safety first and full disclosure, I would feel compelled to advise any potential buyer that it needed new tires and why. How would you feel if you sold it and the guy crashed it (or worse) his first time out?
That said, I would rather buy a coach and put the tires I wanted on the rig. I would choose Michelin because I've had good luck with them. Goodyear would be my second choice. Many on here choose Toyo and Hancock. New Hercules tires, to me, would be a negative or at the very least a neutral, not a positive.
To better facilitate a sale, the coach should be detailed completely...new shiny coat of wax, cabinets hit with Old English, carpets cleaned, new sheets and comforter on the bed, engine and generator washed and looking like new. The cleaner, the better. During negotiations you can discuss the tires. If the guys paying cash, drop the price 2k, if he's financing, include the cost of tires of his choice in the price.
Best of luck. Maybe you can get a smaller coach and still do some weekend camping..Dennis