Disclosed is a bed platform and system for use in an enclosed or partly enclosed space, such as, a cargo space of a vehicle, such as, a van, camper, or truck, among others. By one approach, the bed platform consists of interleaved portions of panel portions that permit relative lateral motion of the panels. In some configurations, the panel portions are adjustable such that the bed platform can be fit into differently sized vehicle cargo spaces. In addition, the systems described herein also may permit the bed platform to be adjusted or moved to different heights even though the wall configurations may be different along the height thereof.