Appropriately enough, it’s called The Keep. And it’s designed as a home. Past its sliding front door, the interior is small and spartan. There’s no furniture, only three windows and a skylight.
The Sandy, by Indigo River Tiny Homes, is based on a triple-axle trailer, with a length of 36 ft (10 m). It's finished in smart siding engineered wood and has two storage boxes outside.