Great article can be found in the August issue of Trailer Life magazine, pages 38-42, written by Lisa Ballard. I'm sure it will address most of your questions. It provides an excellent account of a similar trip on US Rte 89, north through Wyoming and Montana (also known as the National Park Highway). This route takes you through Grand Teton, Yellowstone and Glacier National Parks. The author provides excellent advice on where to stay, things to do, and a list of those things you need to know before you go (permits, maps, and fuel stop recommendations).
Trailer Life offers tempting travel destination trips in each and every issue. Not all are practical, or of interest to me, but Mrs. Ballard has succeeded in adding this trip to my bucket list!