Check out this notebook stand, which might be useful in the confined space of a camper, or outside with a lawn chair:
http://jkontherun.com/2009/07/16/nottable-laptop-stand-use-your-notebook-in-any-position/
The stand can be adjusted to work in a very wide range of positions, including standing, sitting in a chair, sitting on the floor, and everywhere in between. The stand is expensive, so you might want to simply study how it works, and fab up your own version.
http://jkontherun.com/2009/07/16/nottable-laptop-stand-use-your-notebook-in-any-position/
The stand can be adjusted to work in a very wide range of positions, including standing, sitting in a chair, sitting on the floor, and everywhere in between. The stand is expensive, so you might want to simply study how it works, and fab up your own version.