The Yakima FreshTrack works well for fishing rods. It is available in two sizes; the FreshTrack 4 (47.5cm loading width) and the FreshTrack 6 (730mm loading width).
You load your rods with the tips towards the front of the vehicle and if your rods are over 7 ft you'll need to break them down. The rods need to be spaced around 3" apart. You can use rubber bands to secure the ends.