Scamps are great lil campers. I think one of those would be almost the perfect 1 person nomad home.
It's about the smallest, lightest camper I can think of that would still have what you need (just add your own toilet!)
The
TAB may also be good, but I think they are very overpriced compared to what you could find an old used Scamp for.
Here is a link for a web page a guy made talking about very small campers.
At the bottom is a link for
CampInn. These guys are a couple hours drive from my house. I went up to visit them when I was building my camper and bought a few specialty parts. I also met a guy who owned one of the Camp Inn trailers - really nice!