Wow, that sounds like an awesome trip for RVers!
For the
Grand Canyon National Park, you're probably going to be at the
Grand Canyon South Rim. That's the more popular area, and in September it starts to get trickier at the North Rim. Either way, you want to call ahead, campgrounds get booked way in advance.
You could check out
Trailer Village RV Park for full hook-ups. That may be the best option inside the park. Also see
Mather Campground, I think they may require a reservation in September.
Maybe also look into the
North Rim Campground if you don't need hook-ups.
