Dr Quick wrote:
Because you have a new vehicle, I would recommend that you go by the book, otherwise you could void your warranty. Since Ford chassis is a heavy duty, this could be a manufactures requirement.
That is the correct answer. Stick the the maintenance schedule specified by the manufacturer, document it and keep receipts. If you have something go bad you will have evidence of taking care of it per the manufacturer's specs. I would even do it beyond the warranty period. Manufacturers will often go beyond the warranty period for catastrophic things like major engine failure.