FORD 2005 F-550 v.2 - Manual (Page 230)

If the vehicle is towed by other means or incorrectly, vehicle
damage may occur.
Ford Motor Company produces a towing manual for all authorized tow
truck operators. Have your tow truck operator refer to this manual for
proper hook-up and towing procedures for your vehicle.
2005 F250/350/450/550 (f23)
Owners Guide (post-2002-fmt)
USA_English (fus)
Roadside Emergencies
230