Other than bringing the tools you need to fix most things along the way, I'd sign up for some sort of roadside assistance program and would also plan for more days than needed for the return trip. Second point is twofold. It gives you extra time in case you run into any problems along the way, and if things go well it gives you time to check things out for fun along the way.
I always screw myself over on roadtrips and never have enough time to stop and smell the roses along the way. Plenty of cool stuff along the way if you are willing to detour off of the most direct route...Corvette Museum in KY and The Henry Ford in MI are two that immediately come to mind depending on the route you take.
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