If it has the factory tow package, it should have a plug under the dash for the brake controller, and the brake wiring should be run to the 7-way RV plug in back. It should have the auxiliary cooler in it already, also. Look for an oil cooler in with the radiator and AC condenser, if it has AC, to verify.
When you get your filter it'll come with both gaskets. Just use the one that fits your pan.