Take a generator if you can and don't be afraid of dry camping. The commercial campgrounds in Alaska are nothing special but the public ones are great and the ones we stayed at had large sites. But it was dry camping. Denali has the best dump station I have ever seen (and fresh water fill). We stayed at an RV park in Cantwell and checked in to Denali the day before our stay. We were given all out paperwork for our arrival the next day. We arrived early, dumped our tanks and were lucky enough to get a double wide spot in Riley Campground. The Church's campground book is essential because many campgrounds do not have traditional addresses and you have to enter Lat/long into your GPS. We loved every minute of our trip in 2014 and plan to return in 2017.