Diane from the airport Savannah/Hilton Head was awesome! She helped me figure out an option when I realized that I reserved the rental car through the wrong airport. She helped me remain calm and found us a minivan that would accommodate my large family & our luggage.
Unfortunately, I learned that if you accidentally order a car and pay in advance..and accidentally book the wrong airport (there are 2 Hilton head labeled airports), you cannot transfer any of the prepaid car to the new location. I paid in full for 5 days and Hertz said it's a locked in deal so they wouldn't honor even a discount. So, I had to pay for 2 vehicles on my trip. Completely, not cool.