We will be driving a 25 foot RV at the end of Sept. and Oct. and plan to visit Utah, Wyoming, Colorado, Arizona, and New Mexico. We plan to visit the national parks, like Yellowstone, Grand Canyon, Mesa Verde, etc. and drive over the rockies. Will we have trouble driving some of these roads? Will the RV campsites be full at this time of year and do I have to make reservations, and if so, how far in advance? Do you recommend joining a club like Passport America or Good Sam? Are there good books someone can recommend about the roads and about RV sites.