I'm doing an option by option comparison between the Wagoneer and GW and noticed that for the GW it says that adjustable roof rail crossbars on not available for GW. Does this mean that the same crossbars from the Wagoneer can't be installed b/c the makeup of the roof rack is different, or they are simply not available, or does the GW have its own variation of the roof rack that already has built-in crossbars? Why would a SUV marketed as being able to haul around the whole family and all the family's stuff but not be able to be equipped from the factory to throw anything on the roof?