Ductless AC instead of roof mounted AC

I have a 12,000BTU, 110V Mini Split air/heat pump in my cottage. It's 750 sf and moderately insulated. The 12,000 btu is more than big enough for our application. I bet it will easily cool your camper, even though it is not well insulated. The beauty of the Mini Split is it's VERY quiet. Your more likely to keep it running all the time when it's hot because you forget it's on. I know the noise of my roof top unit drives me nuts after a while and I find it difficult getting to sleep with it cranking away.

I've also explored the idea for my camper, but alas I just can't find a place to fit it. :( Good luck with your idea!