I have a 40" core aerator that I have used my Honda Rubicon to pull. My dealer made me an offer on an older MTD 18hp Garden tractor today that was out behind his shop. Deck is shot, motor sounds good. Tires are all up and in good shape. Needs new battery. Has a high and low range with six gears in each range. He has offerd to install a new battery and take the deck out from under for $200. What do you guys think?