FWIW, I'd second the suggestion of getting a "local-focus" guidebook such as the Lonely Planet series as that will help identify activities for the times one is not driving or sitting at the RV.
Never used the Church book but back in the day when I traveled up and down the Alcan at least once a year, I always carried the Milepost, primarily to ensure I was following the right road (more of a concern once in BC or Alberta than on the Alcan itself) and to get an idea of distances. I always found it to be useful for at least 3-4 years after it's publication.
Sue T's posts are full of great insight and information about the area and road.