The Cube Project habitat, designed by Mike Page of the University of Hertfordshire, has some interesting ideas that could be used in a camper. (you probably wouldn't want a 3 meter high camper on the back of your truck, but putting the two levels side by side could work).
Here's a 360* view of the interior
http://www.360pix.biz/tours/cubeproject/
here's a Vimeo video in which Dr. Page introduces the habitat
and here's the web page http://www.cubeproject.org.uk/
Here's a 360* view of the interior
http://www.360pix.biz/tours/cubeproject/
here's a Vimeo video in which Dr. Page introduces the habitat
and here's the web page http://www.cubeproject.org.uk/