Abstract: An apparatus arranged for securement to a roof positioned above a passenger compartment of a vehicle, wherein the structure includes a grasping tube receiving a flexible tether line therethrough, wherein the tether line is mounted to a securement loop and the loop is pivotally mounted to a hook clamp that is releasably mounted to the roof of the vehicle. A modification of the invention includes a plate structure with a loop member adjustably mounted longitudinally of the plate to provide selective orientation of the tether line and tube within the passenger compartment.