TOYOTA 2013 Prius PHV - Manual (Page 422)

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2-5. Driving information
PRIUS PHV_OM_OM47787U_(U)
Trailer towing
Toyota does not recommend towing a trailer with your vehicle.
Toyota also does not recommend the installation of a tow hitch or
the use of a tow hitch carrier for a wheelchair, scooter, bicycle, etc.
Your vehicle is not designed for trailer towing or for the use of tow
hitch mounted carriers.