Thanks for all of the nice comments.
We have often been asked, how do you plan your trips for two months? How do you make reservations? My answer, which seems to astound some people is that in all the trips that we have made, we have rarely ever made campsite reservations. We like to travel after Labor Day and have found that if we get to a National Park from Sun to Thursday, especially before 3 pm, we can always get a campsite. The exceptions to this was Florida in the winter where we made almost all of our reservations in advance. But even in Yellowstone, Yosemite and Denali, we have gotten in without a reservation. We have even gotten into the Island in the Sky (13 campsites) and Needles (26 campsites) in Canyonlands without reservations. Often we have found ourselves alone in campgrounds, especially Forest Service, BLM and Native American campgrounds in the US and Canada. With the Good Sam Travel Guide and the Alaskan Milepost, you can always phone ahead if you are nervous. We basically just rough out an itinerary and then just go and plan along the way.