Pre-Order Cool My Camper Air Conditioning - smallest/ most power light camper AC i've seen - could connect to main battery and run as van AC - might be cheaper/easier than installing a standard AC system - probably cheaper overall to just not be home during the day
Portable Air Conditioner for Camper - Originally manufactured for dog houses. Most are mounting to the tong and are commonly used on teardrops. They are currently developing units for larger trailers. A little price.