Abstract: A storage rack assembly in kit form is particularly adapted for use on a vehicle and includes a small number of different types of components to simplify shipping, assembly and installation by a purchaser. The storage rack includes side, front and back generally flat panels connected together to form a generally rectangular structure. Opposed side panels are connected to opposed ends of plural elongated cross members which are arranged in a spaced manner along the length of the rectangular structure and are aligned in a common plane to form a flat support bed in the storage rack. Plural telescoping support/mounting members are each connected to a respective cross member to allow for varying the storage rack's width depending on vehicle size and are adapted for secure attachment to the vehicle. Incorporating additional interfitting side panels and cross members allows for increasing the storage rack's length.