Definitely not planning on spending more than a month in the AZ heat. However we'll likely see high 90's in our trips throughout the rest of the summer. If we continue full-timing by next summer we might just upgrade to a bigger trailer/5th wheel so really only worried about this summer.
I'll give it a couple of days and see if our changes help. We added the foil bubble wrap to all windows late yesterday and it seemed to help instantly. Last night we cooled the unit down to the low 60's before the AC finally shut off. Today we have the advantage of having the foil on the windows from the get go so we'll see.