I have an '04 Corolla and during the summer months I use it to tow my motorcycle quite bit. The trailer with the bike on it weighs around 1000 lbs...towing capacity listed in the manual for the Corolla is 1500 lbs. Just as a precautionary measure, I added a tranny cooler, and I change my tranny fluid every 3rd oil change, which works out to being every 18K miles. I have not experienced any problems from towing and I'm just wondering how much additional wear and tear this puts on the car.