Kawartha have there own employees spray the boxes, no sub out-all in house. The dealership I bought from sends trucks out to line X. Kawartha told me they spray all trucks and never order from factory unless its a package included with models like Laramie. Kawartha have made an investment to be able to do application so its hard to imagine they would let plant do it when they can make more money doing it themselves. I am in no way saying it is inferior, it looks neet, uniform and a heavy coat.I talked to my dealer yesterday and he said we specifically asked the factory to do it when I ordered the vehicle. No doubt that if they receive a truck as part of their regular allotment that does not have it, they will have a local guy do it.
That said, look at your build sheet on line, if its listed then plant will apply liner in MI, if its not on build sheet then its done in Peterborough.