Ryan_2020

I think Smokeywren has the 'most best' answer, which in my opinion is more extreme than required.....but if you aim for that as your goal even if you don't hit it you should be fine.

Myself, I think was only at about 650 miles before I was towing with it (4000 lbs max trailer). The roads we were doing favored a lot of varying speeds and such (lots of corners and winding roads), lots of engine braking / lighter braking than I would normally do just to make sure.

Nicklaus

Mmmm, I wonder about the trucks used commercialy in fleet: not convinced the fleet employees are instructed to break in the truck for 1000 miles, driving around, before to make money out of the new truck (with payload, trailer).

I'm not saying to not follow Ford's manual, just pointing out that this procedure is unlikely to be followed by the business owners (with unlikely consequences I suppose)

smokeywren

That's why used fleet vehicles driven by employees, not owners, are not a good buy - if you want the vehicle to last more than average miles and time. That's why so many fleet trucks get traded in with less than 100,000 miles on them. Employees don't give a rat's patootie about properly caring for their fleet vehicle. My personal vehicles rarely get traded in with less than 100k on the clock, but they never see a service shop except for routine maintenance. Smart fleet owners have strict rules they enforce to change the oil and other routine maintenance as scheduled. But how do you you enforce a rule that says "baby the drivetrain and brakes for the first 1,000 miles" ?.