As far as more space-saving ideas go, I am currently working on a prototype combined toilet/oven -- I am convinced it will revolutionise the camping experience for owners of small vans. Some people seem to consider my ideas crackpot for some reason, but they'll be laughing on the other side of their faces one day. Mark my words. Remember: even Galileo was once mocked for his ground-breaking ideas. Although I must admit there has been some anterior-singeing collateral during the early testing phase of this particular design. Just some minor wrinkles that I'm sure can be ironed out.
There is a transparent skirt (not visible in the photo obviously) and a large fan installed under the van to provide a downwards force (think hovercraft). Unfortunately, currently the leisure batteries are only able to sustain this for about 2 seconds, so there may need to be some more work done as far as the power source is concerned. A relatively minor consideration, I am sure.