This would work, bed could also be couch with just adding pillows. Add bathroom & kitchen, MY NEW HOUSE! :) The Ovida tiny house, a 160 sq ft vacation rental at the Getaway House resort north of Boston.
The Atelier Praxis, a modular tiny home manufactured exclusively by Minimalist in Quebec City. A 180 sq ft home with an innovative design to maximize space. Now this is an awesome tiny home though maybe not on a trailer