...of the camper variety...
I want one! They have sleeping space with a few storage cabinets inside, and the back opens up to a pantry / kitchen area. They are small and light enough to be towed by small cars and large motorcycles. They can be pushed by hand into an RV spot for those of us that are not so good at backing in.
Photos are from Flickr. Click on the picture to see the original post and more photos of teardrops.
This guy built his own. There are instructions available on the web. I wish I was talented enough to build one of my own. Or knew someone who could help me build one that wouldn't fall apart the first time I hit a pothole or a speedbump. The ones for sale at RV dealerships cost at least $5000. That's not in the budget.