At 200K miles stuff is going to start failing. Fuel pumps, water pumps, alternators, injectors are all approaching end of life cycle. They may go another 100K but they all could just as easily all fail tomorrow. Trans is likely getting close to rebuild. The basic motor could go another 100K miles before rebuild time. So its a toss up. Once things start failing, it will be a never ending cycle.
You might start shopping for a two year old low miles truck and see what it would cost you. Another considerstion, if it were to fail you on the road are, or would you be prepared to buy so you could get back on the road. Or would you be better off doing it now when you have some bargaining power?
