We are taking a cruise this summer that will terminate in Whittier. We are planning to rent a car there and drive to Denali National Park for a couple of days. There are only two car rental options in Whittier: Avis, which is pretty expensive, and Harley's Rent Alaska, which is much cheaper. Has anyone ever rented from Harley? If you run into trouble on the drive to Denali, how do you get help? Our cell phone won't work there. Is there enough traffic on the road that getting help won't be an issue? Is this a safe drive for a couple of senior citizens?