Habitat aircon for nuevo es

Hi,

I am thinking about having habitat aircon fitted to a Nuevo es. Not sure whether to get a roof mounted unit or underbench. Because of the limited storage space in the Nuevo, Ideally I would like under floor ie externally, but can't find any unit where under floor installation is permitted. I would also like to use an inverter so that the aircon can be used on the move.

Has anyone out there done anything similar? I would be interested in any personal experiences.

Thanks