A crew rest berth support system includes a crew berth assembly having first and second berths. Hook assemblies suspend the first berth from mobile platform structure. Pin assemblies suspend the second berth from the structure. Cam assemblies connect the first and second berths. The hook assemblies permit first berth rotation in a first path and the pin assemblies permit second berth rotation in a second path substantially perpendicular to the first path. When the first and second berths are connected using the cam assemblies the crew berth assembly is restrained from motion in either the first or the second paths. An entrance cap rotatably mounted to the platform structure prior to the first and second berths is also provided.