Yesterday's article on tiny homes, and this one make me laugh because we all get romanced by hipster vans and nifty solar panels but skip right over essential things like ... going to the bathroom! The tiny home article said (and I'm paraphrasing here) you can buy a home, pull it up to a spot of land and *just hook up the utilities!" - it's not that simple. Septic and water are not electrical plugs - hell even electrical is not as simple unless you're in an RV park.
Edit: Just to be clear, I spend a good deal of time traveling myself. I now tow a 26 foot travel trailer (with kitchen and full bathroom) but before that towed a small utility trailer that I converted to a travel trailer for my kids and my office. We stay at campgrounds with septic hookups and showers (which I prefer over my trailer shower). Whenever we "dry camp" we then have to find a place to dump our septic, grey water etc. it's a real pain (Google "honey wagon" for a fun look at a "good" option for handling your own waste). Typically this is done at a campground (for a small fee), but I'm not sure how it would work for someone living in their van ("can I dump a bucket full of piss and poo?").