Toyota 2010 Prius Owner's Manual page 512

5-1. Essential information
CAUTION
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Installing towing eyelet to the vehicle
Make sure that towing eyelet is installed securely.
If not securely installed, towing eyelet may come loose during towing. This
may lead to accidents that cause serious injury or even death.
Towing with a sling-type truck
NOTICE
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To prevent body damage
Do not tow with a sling-type truck, either from the front or rear.
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