Wasn't suggesting either place as a destination in the summer! Though we did enjoy watching fireworks last 4th of July from the air conditioned comfort of a 2-room suite on the 30th floor of the downtown Phoenix Sheraton, leaving our mountain home gridlocked under hordes of invading "flatlanders" toting giant toyhaulers. For a ridiculously low price, too, and our car in a covered garage.
But I digress... not a destination, but if it is necessary to spend a night in the desert in the summer while passing through, a motel for one night might be more cost-effective than upgrading the trailer AC just for that one night in extreme conditions. We sometimes break up the drive to our Carlsbad Scamping beach vacation in Palm Springs. In a motel. No need to leave the car running all night.