Harvesting water from air: dry camping gets moister?

Of course "water from air" compressor based devices have been around for quite some time - if one has the generator or solar power for them and if the air humidity is from 35% on up - which rules them out where you might need them most ... the desert.

Here's some real life models that could possibly be used in larger RV's that have the room and electrical energy for them ... I wish the company offered a smaller model for RV use: http://www.air2water.net/solutions.html