A deployable corral system for a transport trailer, such as a livestock trailer, provides a readily deployable corral along the trailer, and is readily stowable along the trailer in a retracted configuration for travel. The corral includes a pair of spaced-apart and pivotably-extendable corral rails with a cross-rail extending between distal ends of the extendable corral rails. When the extendable corral rails are extended the cross-rail is spaced from an exterior side of the livestock trailer, and when the extendable corral rails are retracted the cross-rail is positioned near a roof of the trailer. A drive system is operable to move the extendable corral rails between the extended and retracted positions. Optionally, the drive system is powered by motors associated with linear or rotary actuators. Further options may include storage bins along the cross-rail, a deployable shade awning, and a deployable trough.