Welcome to the Forum from Western New York State! Look it over inside, outside, and underneath, twice. If you have a family member/friend/neighbor that has RV experience, ask if they'll take a look at it with you. Make sure all the appliances work well. like the fridge, stove and oven, microwave, air conditioner, furnace, and water pump. Check around any inside plumbing you can see, for signs of water leaks or damage. Ask to see any maintenance and repair receipts for proper care. You didn't mention the year of the Greyhawk, or how many miles on it. The reason they're selling it?
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1 Spoiled Dog