I bought a 2001 F250 7.3L that was a fleet vehicle. It was leased from Ford by a tire retail chain. In five years it accumulated 260,000 miles. It has 275,000 now, and has had no significant problems in between.

Sometimes fleet vehicles get better maintenance than private vehicles. Also, there is a chance that the miles were mostly highway, unless it was a city delivery wagon!

Once you get more than 100,000 miles on any pickup, something can go wrong at any time. Brakes, Transmission, wheel bearings, etc. are all wear items that can give out at any time. That is why you pay less than new price. Hold back at least $1,000 from what you think the truck should be worth so you have a fund to fix unexpected problems. this needs to be hard money that you can access on short notice.

Once you get the truck, enjoy it! You will love it. Unless it has a rust problem from salty roads, a Superduty will last pretty much forever if you keep it maintained and replace the worn parts as needed.