I was thinking about getting a hitch for my bike rack but this was in the manual: 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. I understand the drivetrain might not have been designed for towing but why are they frawning on a hitch for a carrier, as long as the weight added does not exceed the total payload capacity? Is the frame super weak or something? Any warranty issue if one is installed against Toyota's recommendation? There are plenty of hitches made for the Prius on the market.