In one series of embodiments, a carrier system includes a rack mountable on a vehicle to transport material. The rack includes a frame having one or more suction cups attached to the rear side of the frame, e.g., for attachment to a surface such as the side of the vehicle. A support bar mates with the frame. The support bar and the frame may include attachment configurations which mate with one another to selectively and securely attach the bar to the front side of the frame with the bar extending in a direction away from the one or more cups. With the rack comprising a plurality of suction cups, the frame may be configured as a plate or may comprise a series of arms or connected braces which extend away from a center position to the suction cups.