Methods and arrangements for providing and controlling operation of a dual sided opening roof mount cargo box for a carrying vehicle. A dual sided opening roof mount cargo box is has a lid portion releasably hinge-connected at two lateral sides to a bottom portion of the cargo box for alternate pivotation at each of the two lateral sides between open and closed configurations. A pair of spring-biased struts are provided, each operatively interposed between the lid portion and the bottom portion, and one each of the pair of spring-biased struts being located at the two opposite end regions of the cargo box. An expansively directed force is imposed on the lid portion, utilizing the pair of spring-biased struts, during operator induced movement from the closed configuration to the open configuration and thereby assisting the operator to smoothly open the cargo box.