Joanie and Dave,
I don't think that your Dodge Cummins will have any problems making the climb on any of the hills using the inland routes unless you know that you have a problem with it. Keep it throttled down and the RPM's up when climbing and you should have no problems with overheating.
Take a look at I-4E to I-95N to I-26N to I-77N to I-81N to I-84E
Happy trails.
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