2003 Toyota Prius Owners Manual - Page 23
2003 Toyota Prius Manual
Page 23 highlights
D When your vehicle needs to be towed, do it with the front wheels or all four wheels raised. If the front wheels are on the ground when towing, the electric motor may continue to generate electricity which could cause leakage of electricity and a fire depending on the degree of damage. See "If your vehicle needs to be towed" on page 182 in Section 5. 16