You may not believe this, but I would not go smaller than a 5K (5000) btu. The reason? Lack of insulation in the Scamps (and Casitas, etc). I have the roofmount 9200 BTU and on the hottest days in the southern sun, it will almost run continuously! What you're suggesting may be ok for night-only use when the sun is gone. Just keep all of this in mind.
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