They also have commercial FORD truck centers (not a regular ford dealer that may or may not have service capability).
Correct. Not a ton of them around and it mostly has to do with the affiliation to Isuzu that dates back to early 90's maybe it was even the 80's. At any rate they have had far longer to sort this issue out and its still not a great network.
I take our F650 to a heavy service shop that's technically a International dealer but they will service any heavy chassis as long as its not manufacturer defect warranty work. I was tempted to call them and ask about the cummins portion of our rigs as they are a warranty service center for heavy duty cummins stuff that comes in the international chassis's. I may still try as they are super close to me and great to deal with.