Welcome the forum.
About 3 months ago I stayed at a KOA just out side of Williams, AZ
Nice, clean, and quit place, with shade trees
It is not in Town; so if you want to go on the different tours, you will need a toad, have to drive into town with you RV, as I did. There is plenty of parking for RV in town. My sweetie and I took a Van Tour that also included a half hour helicopter ride for about 250 a head. I could have driven it in the RV, but he knew where to go, and did give a lot of information about just about everything, and I was able to look out, and not worry about driving.
Hope this helps
Hello Fred and welcome, we stayed at the KOA in Flagstaff AZ. It was OK but some spots was tight. I also towed a toad for getting around, we went to the Grand Cannon and all the other had to see sights. As Pancanbob said, you can take tours either by copter or van buses BTW is what I recommend as you being the driver are able to see and hear more than having to worry about driving and being safe. Good luck and enjoy