RP,
You say home like it is GR. Correct?
If yes, I don't need to tell you about Michigan weather.
April is very unpredictable. If I were making that trek, I would be sure water and propane were full and add an extra day of unplanned camping.
As to how I would do it, I would leave Raleigh for headed west on I-40 for Knowville. At Knowville change to I-75 North to Cincinnati . Both Cinci and Indianapolis have ring roads. Take I-74 out of Cinci to Indi. Use I-69 north out of Indi and you are almost home.
You could also go west on I-64 from Lexington to Louisville and then go north on I-65 to Indi. We don't go that way because we are usually going to the FMCA free camp in Cinci when we go north or south.
Matt