Ford customer service isn't in the import/export business, so wouldn't expect them to be of much help. US mfgs have produced vehicles that do not confirm to US standards, thus strictly export. Don't think this applies to Expedition though.
Open your drivers side door and the white sticker with all the specs and information, right in the center there needs to be a statement about 'this vehicle confirms to all federal standards' and so on. If that is present, which I suspect it will be, your import will be easy. Since its relatively new, the EPA already has the emissions documents online that you will need. Under your hood should be an emissions sticker which has a long string of numbers. You and customs need to be able to read this sticker. Each year the number changes for every vehicle.
Download EPA form 3520-1 and Customs form HS-7. And proof of ownership, I'm assuming there is some sort of title or MSO. I realize you bought your 2013 new, but if you happen to have a loan against it that could be a problem.
Are you a private citizen using a shipper of your choice or are you military/government and letting them handle it?