Tow packages can include engine and tranny oil coolers, larger radiator, bigger brakes, LSD and rear sway bars. <------------ This is not true for the Frontiers, I'm a mechanic at a Nissan dealership, and we install these hitches all the time. You can add a hitch to any of the Frontiers. Buy, the factory hitch and it usually comes with the harness and relays. the hitch is a simple bolt up and then plug the wiring harness into already set connectors on the left rear of the frame. The relay set will go into the connector hidden behind the right front kick panel. All the instructions come with the hitch, its a very simple install. i just don't recommend buying the receiver through Nissan just because its more expensive and you can buy basically the same thing at any auto store for 1/3 of the price.