Abstract: A hollow, inverted U-shaped housing assembly is provided and the lower ends of the legs thereof are mounted from lower marginal portions of opposite longitudinal sides and in certain installations, mounted to the roof or top of a passenger vehicle body. Guide tracks extend forwardly from the lower ends of the housing legs and the interior of the housing is divided into a forwardly opening forward compartment and a rearwardly opening rear compartment. Front and rear sets of inverted U-shaped support bows are mounted within the front and rear compartments and have elongated front and rear cover portions supported therefrom. The front bows include followers guidingly engaged with the tracks for movement there along and from which the lower ends of the bows are pivotally mounted. Thus, the front bows may be forwardly displaced from the housing and forwardly and downwardly swung relative to the tracks for covering the front portion of the associated vehicle.