An awning support arm for a camper trailer including: an outer member formed with an elongated opening; an intermediate member slidable relative to the outer member; an inner member slidable relative to the intermediate member; an outer fastening assembly arranged to hold the outer member fast with the intermediate member; and an inner fastening assembly arranged to hold the intermediate member fast with the inner member the inner fastening assembly including a user operation portion that extends through the elongated opening of the outer member; wherein the members may be slid relative to each other to assume an extended configuration or a retracted configuration and maintained in either configuration by means of said fastening assemblies.