Counter - point to last post. Adventure Caravans makes it clear guests are free to leave the caravan and re-join as they see fit. We get a trip book at the beginning so we know where the Caravan will be camping each and every night of the 59 days. At this point at day 35 only one person has deviated the group is satisfied with the length of the stays at the various venues in Canada and Alaska. For a 60 day trip that covers all the high lights of the Canadian Rockies, Alaska Highway, Top of the World and Taylor highways, Fairbanks, Anchorage, Homer, Seward, Palmer, Valdez, Skagway, etc. it is quite well done. Personally I might try to find another day at the campground near Denali but this would have cut a day somewhere else.
That said if you have much more time to spend in Canada and Alaska get a copy of the MilePost and build your own trip. To each their own!