Originally Posted by beeser
I have one more related question though. It appears that the transmission fluid is run through the radiator for cooling. How effective is this compared to the supplemental type that uses a separate radiator?
All automatic transmissions from a f-350 dually to a yugo have a primary trans cooler, and that primary cooler is a small tank in the bottom of the radiator which helps to keep the trans fluid cool. Now while that will be sufficient for the yugo in my example, it would never be enough in an f-350, so most vehicles that could see service as a tow vehicle will have supplimental trans coolers. In the f-350 from our example it will be about half the size of the radiator for the truck. The ones we are talking about for the light to medium duty towing that the Tacomas are designed for will be somewhere in the neighborhood of 6x8 inches and sill be mounted in front of the main radiator and kind of low.
I would recommend going ahead and adding the supplimental cooler, as realistically it is incredibly difficult to make the transmission fluid too cool, and it is cheap insurance against transmission related problems down the line.
That said, whoever told you that you'll wear out your truck is full of crap.
Asside from rear shocks and springs (as there is more weight on them as compared to vehicles who never tow anything) there is nothing that experiences accelerated wear while towing, with the possible exception of the trucks service brakes because while the trailer's brakes help the situation there is still additional load placed on the truck's brakes.
Rest easy on your Tacoma afterall IT'S A TOYOTA, and enjoy your camping trips.