I'm pretty skeptical of the recommended solution! Ours is only a 26 ft and class C - so quite a bit different - but we have a single 13,500BTU unit and I've got no complaints. Hottest weather for us has been upper 90s but still it cooled down in reasonable timeframe and stayed cool. I'd expect air conditioner technology to be unchanged in 17 years. Did your previous coach have a single unit that worked ok?
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