I have an 07 Commander, and all it has on top is the molded bars with the 2 holes on each end of each one. I assume these are to attach an actual roof rack. I have no idea. I am clueless about it. Me and my family are going on a road trip, and need to pack luggage or at least a sea bag up top, of course no room inside the truck with 7 passengers. can anyone help me out. Can I strap luggage with the existing bars that are there or do I have to buy and install the roof rack bars. Any feed back would be helpful.