Abstract: A roof rack system for a vehicle which has a fixed cab and a canopy which includes a pair of rails extending along the length of the vehicle and the canopy, and a number of transverse rails for supporting articles. The rails are fixed to the cab of the vehicle by a conventional element, but brackets are provided on the canopy for receiving both the longitudinal and the transverse rails. The brackets are height adjustable to account for differences between the height of the cab and the canopy of the vehicle, or to accommodate the system on various makes of vehicles which may have differing dimensions. The rails include aluminum or a similar material and are substantially oval on the upper part and flat on the lower parts (closed to the vehicle) when viewed in section.