disclosed is an expandable enclosure suitable for a cargo vehicle , a passer vehicle , a stationary shelter or a stationary storage facility . an expansion unit is outwardly translatable from the enclosure by racks fixed to the unit . the expansion unit has first uprights fixed between the racks and second uprights fixed to the enclosure but having a sliding connection with the racks . third uprights are disposed between the first and second uprights and are slidingly connected between the racks . the expansion unit may be mounted to the enclosure by the gears alone or may additionally be supported by a cantilever beam when the expansion unit is being deployed .