A deployable hay pod elevator system for a transport trailer, such as a livestock trailer, provides a readily deployable hay pod, storage pod, or supply platform with the trailer, and is readily stowable above the trailer in a raised configuration for travel. The elevator system includes a deployable supply platform and a lift system configured to raise and lower the supply platform relative to the trailer. The lift system may include a screw drive system or a winch and cable system to vertically raise and lower the deployable supply platform. The lift system may pivot or rotate the hay pod over the top of the trailer for transportation purposes. The deployable hay pod elevator system can be fitted to a truck, a van, or other types of vehicles and can be configured to store and transport various materials, such as hay, tools, or livestock tack.