Stay away from the four wheel drive models, nobody every bought one to be nice to it. The lower mileage the better, even if you have to get one that doesn't have as many whistles and bells. Check the tires carefully, if you are going to need to replace them you should negotiate for a lower price. Keeping up with one is no different than any other car or truck, you keep it clean, service it regularly and drive it gently and it should give you years of life.