2008 Toyota Prius Owners Manual - Page 448
2008 Toyota Prius Manual
Page 448 highlights
5-1. Essential information Using a flat bed truck If you use chains or cables to tie down your vehicle, the angles shaded in black must be 45° . Do not overly tighten the tie downs or the vehicle may be damaged. ITY51P008 422 PRIUS_U_(L/O_0802)