We have owned our Rav for 3 years now and are very happy with it , except for the crazy door lock system which seems to have a mind of it's own, but that is a very minor nit to pick with 57,000 trouble free miles. Question is what exactly does the trailer package include . I know it doesn't include the hitch, the trailer wiring ( not even a play and plug hook up ) so what is included ? I suppose a heavy duty alternator and maybe a heavy duty radiator and a transmission cooler. The reason for the question is I tow a lightweight fiberglass camping trailer, 2400 lbs on a certified scale, and am thinking of adding a transmission cooler if transmission fluid cooling hasn't already addressed in some form or fashion. Thanks Lee