We have been planning this trip for a long time and one of the really good tools is YouTube. We have found three in particular to be worth watching: Long Long Honeymoon, Keep Your Daydream and The Motorhome Experiment. All three have been to Alaska recently and all three have decent skill at video, although we like the first two more that the latter. You can see with these programs various campgrounds, roads, attractions and even issues that arise. We are watching several of them for a second time now that we have more of an itinerary and a better understanding of where things are located. There are other good videos as well, some from Alaska tour operators some from the state but just explore your destination - there are likely lots of videos to watch.