The hitch offered on yournissanparts.com is advertised as an oem part which suggests to me that it is the same hitch that would come on a Titan that has the Big Tow package. If this is the case, why is the rating on it only #7500 pounds? It doesn't make sense that they'd put on a hitch that is 2000 pounds shy of the vehicles' tow capacity. Is there something i'm missing / is the hitch actually capable of more weight / or is that correct? Thanks for any insight.