One is Coodo. Simple, elegant, functional shape, multipurpose use and modular capability attracted my attention.
The Slovenian designers claim the module can withstand from -40C to +50C. I would be interested to know how they are going to provide that given large - although unarguably attractive - window surface area. I would like to know also what source of energy they use to maintain comfort and allow all modern conveniences from shower to TV and internet. I hope it is not a diesel engine and not the propane.
Ascent Systems offers a solution - compact and "green". It's Aero-Solar technology uses solar thermal energy as the main source with high-capacity ultra-compact thermal storage and super-efficient thermal booster. It reduces energy consumption by up to 80%, and because it requires very little electricity to operate, it can also be provided by solar PV modules integrated into the system making completely autonomous.
Another interesting concept is Romotow. This is a sleek foldable trailer, designed by the New Zeeland team from W2 Limited.
It can definitely benefit from utilizing the Ascent's technology to provide for its energy needs.
Moreover, I can picture it being used to house a packaged Aero-Solar configuration to provide energy for remote locations with no access to the grid or other sources of energy, like for example heli skiing camps.
And why not to attach it to electric tow vehicle and make the full thing totally "green" ? Connecting technologies in action !