It is possible but likely not a lot of fun. Tombstone, GCanyon, M Valley are in kind of a line. Tombstone can be a one day stop. Grand Canyon south rim is one day unless you are going to hike below the rim or mule trip down. Or drive to see the glass platform over the canyon. Monument valley is two days. Take the tour. See the john Wayne stuff.
Just my opinion but this would be one case when flying to Phoenix and picking up a rental RV would be more enjoyable. It would take me a minimum of two months to do this trip in our RV.