We just bought our new Cougar (early October)... Prior to this past summer I would have bought it with just the one A/C unit...
We spent a couple of months out in the south western states (August and September, duh, what was I thinking). El Centro for 3 days comes to my mind right off... 118 degrees cooling off to a low 96 degrees at 4 am according to my thermometer. At the time we were in our old FunFinder 210WBS travel trailer (21') and the A/C could barely keep up running full tilt 24/7. There were other areas that were almost as bad, Bakersfield, El Paso, Kerrville, Houston, etc. I opted for the second A/C in our 35 footer...I'd rather be "over capacity" than be caught short when it comes to cooling under those circumstances.
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My 2 cents, your mileage may vary...
Don
Bronwyn
2 Cats; J-Lo and Ragamuffin
2011 Keystone Cougar 318SAB
2011 Ram 2500 Longhorn CTD HO
Built in brake controller and exhaust brake
Tri Glide TrailAir Pinbox / B&W Companion Hitch