How long can I expect a 2007 Ford F-250 superduty with a 6.0 diesel to last?

I am looking at purchasing a 2007 Ford F-250 super duty with the 6.0 diesel in it. Current mileage is 154,000 and from what I can find on it has been serviced fairly well and was a texas truck. I only intend to use it to haul a 30' travel trailer a few times a year and maybe some local driving around town from time to time, but not really daily use. But my question is how reliable are they?

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