Honda 2013 Odyssey Owner's Manual page 290

uuTowing a TraileruTowing Preparation
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Automatic transmission cooler
Install an additional ATF (automatic transmission fluid) cooler to help prevent the
transmission from overheating, and damaging. You can get the additional ATF
cooler at a dealer.
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Trailer mirrors
Many states, provinces and territories require special exterior mirrors when towing a
trailer. Install special mirrors whenever you cannot clearly see behind you, or if the
trailer creates a blind spot.
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