Ill add my .02 worth. Motor home have a big disadvantage when it comes to Heat and Cold. The windshield. It is safety glass per DOT. Travel trailers and 5th wheels don't. In our Challenger, on a trip in 98 degree heat both AC worked very hard, but walking from front to back you could feel the temp difference.
Second AC is a good idea, if not possible, then a outside windshield cover and window awnings would help a lot.
KC
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2015 Challenger 37KT
Progressive Industry EMS-HW50C, Winegard Trav'ler Sat dish, Magnashades, 5 star tuner, lots of indirect lighting.
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