IRP

Here is the back story:
I recently purchased a truck through Paccar financial and I will be signing on with a carrier that gives me the option to run under their plates. I have a temp tag for now (since I just purchased the truck) and am confused about how titling and IRP are connected. The part that confuses me is that I want to run under the carriers plates. For example; I live in NC. The company that processes the title for the lender wants to send it to the IRP office in my home state; North Carolina . I guess I am just missing the connection here. So, does running under the carrier's plates dictate how I proceed with the title? Or when the time comes is there a procedure to move the plate to the carrier's state?