My wife and owned a 2014 Jayco Whitehawk 28DSBH. When we ordered it, we ordered the upgraded AC unit and insulation package. We never had any issues with staying cool inside during the summer. A fe...
Cover floor vents if so equipped. (Cold sinks into them)
If water is free and plentiful, I set a timer to "sprinkle" the trailer down three or four times an hour. (The evaporating water acts like a swamp cooler and brings the skin temperature down.)