Abstract: A modular vehicular storage system includes a sub-frame coupleable to a vehicle chassis. The sub-frame is selectively configurable between an expanded and retracted position to accommodate a variety of vehicle widths. At least one storage element, such as a storage container, is mountable to the sub-frame for securing a number of items. The storage container may include a base and a cover movably coupled to the base between an open and closed position for selective access to the interior of the storage container. The sub-frame may accommodate any number of alternative storage elements and may be configured to simultaneously support a number of different storage elements at a given time to provide the user with a number of storage options.