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9000 would be plenty. If you are going to paint, consider this: http://www.ceramicadditive.com/insulating-paint-additive.html Not expensive, I plan to do my rv someday. It worked well for a friend.

It does depend somewhat on what you plan to put in it. You have to consider the internal heat load, external temp and the solar gain (how much the sun warms it up) which is the biggest problem. For solar gain you could also try painting it with the ceramic additive. supposed to make a huge...