Dear Bravestdog,
You will find that most use the aux genset to power the roof or basement airs when driving and when parked without an external power pole available.
At 90*, you may find that a/c in the rear is not that necessary with roof vents and a couple of windows open, but then again, I live in Arizona so I am used to the heat.
Your question about the natural ventilation will depend upon how many windows can open and how many roof vents there are and if they have a good fan such as a Fantastic Fan unit. You can also leave the door open with the screen door closed.
Peter.
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