I am planning on a move from Washington to SoCal (1200 miles) at the end of August. The car will be loaded as will a 4x8 uhaul which will likely weigh in at 1300lbs full. After looking into a external transmission cooler on these vehicles i was unable to find an instance of a newer rav having this addition. Whats the verdict on the necessity of a trans cooler on newer gen ravs in addition to the stock one on the vehicle already? I can see how it can help extend life of the trans, but if the stock cooler is enough on newer gen Rav4s it seems like a redundant addition that could void warranty if something broke.