Systems are provided for storing and retrieving objects such as ladders. The systems can include a carriage having a table that rotates, and a trolley mounted on the carriage for holding the object and moving the object linearly in relation to the carriage, so that the object can be stowed in locations such as on the roof of a fire engine or other emergency vehicle, or the roof of a stationary structure. The systems include features for locking the table and the trolley to increase the safety and efficiency of the loading and unloading processes.