N55

Danish artists and activists at N55 developed the walking house so that one could live nomadically with little environmental impact: energy is collected via solar cells and small windmills and a small greenhouse module can be added. And not only can it collect rainwater, it's amphibious.
N55 says "The Walking House requires no permanent use of land and thereby challenges ownership of land and suggests that all land should be accessible for all persons. Society could administrate rights to use land for various forms of production of food for example, but ownership of land should be abolished."
TreeHuggers may remember N55's micro dwellings, similar but without the walking legs.

Living is.be

Living is.be combines the best of an RV (easily mobile) with the efficiency of a popup camper (folds down for less wind resistance) and the comfort of a multistorey townhouse. It even has a hot-tub sized bath on the upper level.
It appears to be built with an aluminum frame, while the pop-up is made from an insulated, quilted fabric much like a duvet. The rigid roof hinges up to create lots of space and includes two big walk-out sized velux-type skylights.
The lower level appears to be filled with all of the tanks and technology to be independent of water and sewer.
All added on top of a standard truck frame, a "faux chassis" on top of the real chassis, so it is possibly convertible for other uses.