These have showed up recently at an area RV dealer, Parkway RV Center. http://www.parkwayrvcenter.net Haven't seen one in person or ever done business with this company. Don't know what their bottom price would be nor the quality of the build. They're calling them Cruisers & Mini Cruisers. I'd be tempted to call them "Just-A-Box". Yet, it is the simplicity that I like about this idea. Just thought it worth mentioning here. (That AC unit on front with nothing covering it looks like an invitation to water intrusion.)
They also have a bigger version: