I have been here in Az. for 41 years now and settled on Collinite products ( mainly 476s ) for LSP. I do rinseless washes 99% of the time and use Optimum no rinse wash and wax with the Car Wax in it. About once a Month or so after a no rinse wash I use Optimum Car Wax full strength. The 476s gets another coat some where around 9 Months. The Wife's 2005 Toyota Sienna has been exposed 24/7 365 days a year and still mostly looks better than new. The1999 Dodge 2500 was in the garage when not being used and has 90k miles on it now. Since retiring 1 1/2 years ago and selling the house as we travel with the 5th wheel the 2500 has had a cover on it off and on as it is the lesser of the evils without a garage and the Toyota is the run about vehicle. The cover installed and strapped keeps the truck surprisingly clean and when it does rain or the monsoons come I only have the Toyota and 5th wheel to clean. Welcome to AZ. 5 Months of "The Valley of the Sun" 7 Months of "The Surface of the Sun".
Dave
Welcome to AZ! I've already survived my first summer here, so I'm considered a resident now!

Also, I've started a group here on the AGO site (didn't know they existed, they must be new!) called Arizona Auto Detailers:
https://www.autogeekonline.net/forum/groups/arizona-auto-detailers.html
+1 on the Collinite 476/845 >>>>> "Leaves behind carnauba shine and durable coating that preserves finish and shields against the elements; UV, rain, snow, salt, dust, dirt, grime, bugs, staining and more." I have all the Collinite products in my line-up of offerings, however, I've been using them less and less, and now they're just collecting dust.
What you'll expect is a rain shower that is proceeded by dust storm. The rich minerals in the dust will mix with the water and leave water spots from hell. Good protection is a must!
Just offering a different opinion and this where I differ from David a bit. I've since left waxes in the dust.... Literally. The issue with carnauba is, I have found it to attract and hold dust. My vehicles have CQUK and for customers vehicles I recently switched from using CQUK/CQClassic to Gtechniq EXO. This allows several things: good protection from UV (most important), spots and dust. It also helps with maintenance washes and getting the water off the vehicle quickly with a blower. Longevity is pretty darn good. They act as the sacrificial barrier between your paint and light scratches, dust, bird & sap droppings. In my experience it takes two coats to protect against monsoon dust/water storms.
The downside is you will not be able to apply such a coating in sun-light, and there is a bit of a learning curve when it comes to applying coatings. The pro to Collinite, is it's bubba proof... Wax-on-wax-off and it does leave a deep rich shine. Like everything there are pro's and cons to each.
I moved here from New Hampshire, and I must say, despite brutal winters, nor-ester's, bitter-to-the-bone cold (with ocean effect), I have to say Arizona is a very harsh environment. I'm now certain that the surface of Mars is about equal. Good luck!!!