I drew this in Google SketchUp, and knew I didn't have the skills to actually draw wheels, so I downloaded some mountain bike wheels that happened to have disc brakes on them. So ignore those. =P

I really like the idea of the top coming off to form a flat-bed trailer, maybe I can figure out a way to do that.

I guess the only real advantages over a tent are: Not having to set it up, staying totally dry, and somewhat more warmth i suppose. Mostly I just like the idea of having a self contained unit that I can keep set up with my sleeping bag and stuff all the time. I'm not sure if I can really justify this over a tent, but I like it.