Look for indoor storage or at a minimum, covered storage. The heat will be terrible on the outside but figure the interior temps will approach 130+ as well at the peak of the summer.
Here's a tip... search for "indoor vehicle storage", not "indoor RV storage". I live in the Bay Area and when my indoor RV storage located in Hollister, CA closed I searched far and wide to find something similar. I just about gave up until I happened to be cruising through Craigslist ads and found a lot of indoor vehicle storage ads that I had ignored before. I thought, what the check, I can at least try a phone call. I picked one up and called the guy and though initially hesitant, he agreed to take the truck with the camper. It is a bit odd to have my big 7.3 F350 Dually with Bigfoot Camper sitting next to GT40s, Ferraris and Lamborghinis but I think in about 40 more years my 99 F350 is going to be a sought after antique in it's own right and will fit right in...
Even with the additional expense, indoor storage if possible is worth it in extreme climate situations.