What a nice couple that owns this place! And a nice place. Holbrook KOA is clean, friendly, and right off of I-40, and with wifi, decent cable, and some shaded sites.
The campground is an hour and a half west to the Grand Canyon (and don’t miss Meteor Crater on the way), and it’s less than an hour to Petrified Forest and Painted Desert (both to the east).
If you like pancakes, try the “all you can eat” in the morning… we missed it, but were probably the only campers who didn’t enjoy breakfast.