The TC 300 series flexible steel frame dock shelter services a wide variety of vehicle sizes and types, while providing full unimpeded access to the interior of the trailer. The flexible steel X arm frame yields to misguided vehicles and aids in the prevention of costly building and shelter damage. If an off-center trailer contacts the frame it moves upwards and back to prevent potential damage to the wall and/or shelter. After the vehicle leaves the X arm design returns the frame to its original position.