A system for supporting individuals or objects is disclosed that can be used, e.g., as a bunk for sleeping upon within a vehicle, such as, e.g., a truck or commercial vehicle. The system preferably includes a support platform, a pivot mechanism, and at least one flowable-medium spring. The support platform is provided with an upper surface to support at least one individual or object within a vehicle. The pivot mechanism is connected to the support platform so as to pivot the support platform around a pivot axis to move between a stored position and a deployed position in which the support platform supports the at least one individual or object. The at least one flowable-medium spring is provided with a first end fixed relative to the vehicle and a second end fixed relative to the support platform at a location displaced from the pivot axis. Each of the at least one flowable-medium springs is arranged so as to impart an extension force that biases the support platform toward the deployed position and so as to impart an extension force that biases the support platform toward the stored position during at least portions of the movement of the support platform between the stored position and the deployed position.