FORD 2011 F-550 v.2 - Manual (Page 251)

WARNING: Towing trailers beyond the maximum limit of the
towing system could result in vehicle structural damage, loss of
vehicle control and personal injury.
Fifth-wheel and gooseneck hitch ratings
WARNING: The hitch rating listed on the trailer hitch label is
the maximum possible trailer rating. To find the maximum trailer
weight allowed for your specific vehicle, consult your authorized dealer
or the RV and Trailer Towing Guide provided by your authorized
dealer).
Safety chains
Always connect the trailer’s safety chains to the frame or hook retainers
of the vehicle hitch. To connect the trailer’s safety chains, cross the
chains under the trailer tongue and allow slack for turning corners.
If you use a rental trailer, follow the instructions that the rental agency
gives to you.
Do not attach safety chains to the bumper.
Trailer brakes
Electric brakes and manual, automatic or surge-type trailer brakes are
safe if installed properly and adjusted to the manufacturer’s
specifications. The trailer brakes must meet local and Federal
regulations.
WARNING: If you own a trailer with a hydraulic brake system,
do not connect the trailer’s hydraulic brake system directly to
your vehicle’s brake system. The vehicle’s brake system is only
designed to carry the appropriate amount of brake fluid for the vehicle
alone. Connecting a hydraulic trailer braking system could adversely
affect your vehicle’s braking performance, which could result in loss of
vehicle control, crash or serious injury.
The braking system of the tow vehicle is rated for operation at the
GVWR not GCWR.
Tires, Wheels and Loading
251
2011 F-250/350/450/550 (f23)
Owners Guide, 2nd Printing
USA (fus)