For Grand Canyon area we stay in Williams at the Grand Canyon Railway RV park. It is managed by and next door to the railway that runs to the canyon. We've rode the train but prefer to drive for the day to the canyon. That allows more time at the rim. Should not have trouble getting last minute reservations except over holidays such as July 4th or Labor Day.
Williams is a fun route 66 town thats still reminiscent of the 50's. Lots to do around the area, lakes, Bearazona, deer petting zoo, zipline etc.
