depends really on what 'your' definition of 'cool' is for you...none of us can really answer that, as some get 'hot' when it's on 75 degrees, and others of us not until 90...
my thought, for me, is that I value 'air movement' more than just temperature. Small fans throughout the coach, no matter the size or length of the coach, is better than just depending on a single, or two, air conditioners. The roof units will always strain when there is very high temps outside, high humidity, and you are not able to be in the shade. Even those of us with two units sometimes don't get 'cool enough', at times...it's the nature of the game.
If, though, you have an option, certainly always go for two - you don't have to use both, but you will have them if you do. You'll also find that most any Class C coach will probably not have two, but see what you can find. Most two air conditioner coaches are also 50amp RVs, so if you're mostly at 30amp campgrounds and rv parks, you might not get to use both of them anyway...
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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