We have only owned three RVs, but all have had 2 air conditioners. The two fivers cooled pretty good, one was 38' long and one was slightly larger at 39'. Our present Thor Challenger has two that can barely keep up. I know when the sun is directly on one side you can really feel the heat through the side walls. Three smaller units may work better but with a lack of wall insulation I'm not sure how well.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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