Lots of if's in this, but in many ways this would make sense:
Leave Tucson Monday May 11
Return Monday June 1
I'm figuring about 3 weeks for the itinerary sketched in the previous post.
This schedule, or something like it, divides data, cash, and credit expenses between two periods.
Mileage would total something like 2700 miles: at 9 miles/gal and $2.50/gal that'd be $750 in gas.
Camping fees at $10 (high) per night for 15 nights would be $150.
Food etc would be as at home, but probably a bit less, based on last trip's experience.
Nothing firm about this except the overall shape.