Winnie, that's a great area you're moving to. I spent about eighteen months at Fort Huachuca (Sierra Vista) in 69-70 courtesy of Uncle Sam and really enjoyed the Sonoran desert environment. My wife and I still love to visit whenever we get a chance and decided that's about the only part of the country we'd ever consider leaving eastern NC for.
It does get hot during the day at the lower elevations but the mountains are never far away and offer a great escape
from the heat. Having lived in the south all our lives, 90+ temps and high humidity are commonplace so the southwest doesn't require much of an adjustment for us.
We camp a lot on NC's Outer Banks where there's seldom any shade and the temperatures are comparable to what you'll find in southern AZ. Although we have AC and a generator
on our Scamp
we usually get by with a $20 Wal-Mart floor fan wired into
an inverter. Can't run the genset during quiet hours at the NPS campgrounds anyway.
I'd keep good coat of wax on that Casita to minimize the effects of the sun and enjoy it every minute I could. Keep us posted on your adventures once you relocate. Where will you be moving to? There's not much between Tucson and Sierra Vista IIRC.