As the tiny house trend continues to boom, this mobile option stands out. Heather Underwood and Nicholas Underwood purchased a 1998 Thomas Vista 3600 bus on Craigslist. With just 120 square feet, the couple "managed to create ample living space, a dining room, an office, a guest bed, and storage," Inhabit reports. Yes, all of it really does exist in 16 feet of livable space.With both of their creative minds, they were able to design space-saving furniture that could transform into whatever they needed. Their couch, for instance, can turn into a folding table, ottoman, desk, and more. After spending roughly a year converting the bus into a house, the Underwoods hit the road this April. Since then, they've taken what came to be known as the "Vicaribus" all over the country, tracking their locations on a map, blogging and enjoying the journey along the way.Watch this video to see the entire conversion process: