Earlier this summer I rented a car from a small local agency in Anchorage, called Harley%26#39;s car

We need transportation from ANC to Denali and returning to Whittier for cruise. I noticed that Whittier has only one car rental company....Avis....which is an independently owned franchise. What is the best way to get from ANC to Whittier if we can%26#39;t drop our rental cars off at Whittier and have to leave themat ANC? Car Rental in Anchorage
There are a couple of options. You can take the Alaska Railroad or a bus called The Magic Bus. I haven%26#39;t done this myself, so I don%26#39;t know about the service, but here is their number 1-800-208-0200. There is also a park connection bus that runs between Anc and Denali called The Denali Connection. Hope this helps. Car Rental in Anchorage
Earlier this summer I rented a car from a small local agency in Anchorage, called Harley%26#39;s car rental (they do not rent motorcycles) Since we had the car for 5 days, there was no drop off fee for picking up in Anchorage and leaving in Whittier, where they do have a local office. You may want to investigate this option. Sorry I do not find their phone number right now, but you can find it on the internet.
We have rented cars from both Avis and Hertz in downtown Anchorage (cheaper than at airport). And, it is also cheaper in the winter. Since you are taking a cruise from Whittier I assume you are using Princess Cruises (we are on the Coral from Vancouver on September 11th). If so why not use their shuttle bus from the convention center right to the dock. You luggage problems should be taken care off once you board the bus.
Since you want a car that is the best way between Anchorage and the park (other than the train which is the idea way to go). If you opt for the train the cruise companies have their own cars at the end of Alaska Railroad cars. If you an ';independent traveller book via the Alaska Railroad as they are cheaper.