Ford Super Duty Owner's Manual page 256

Your vehicle may tow a class I, II, III and IV trailer or fifth-wheel trailer
provided the maximum trailer weight is less than or equal to the maximum
trailer weight listed for your engine and rear axle ratio on the following
chart.
To calculate the maximum loaded trailer weight for your vehicle:
1. Start with the gross combined weight rating for your vehicle model
and axle ratio. See the following chart.
2. Subtract all of the following that apply to your vehicle:
• Vehicle curb weight
• Hitch hardware weight, such as a draw bar, ball, locks or weight
distributing
• Driver weight
• Passenger(s) weight
• Payload, cargo and luggage weight
• Aftermarket equipment weight.
3. This equals the maximum loaded trailer weight for this combination.
Note: The trailer tongue load figures into the payload for your vehicle.
Reduce the total payload by the final trailer tongue weight.
Consult an authorized dealer to determine the maximum trailer weight
allowed for your vehicle if you are not sure.
Further trailer and hitch restrictions exist depending on the type of
trailer and hitch listed. This information follows the table listing the
maximum gross combined weight ratings.
Vehicle type
F–250, F–350 single
rear wheel
F–350 dual rear wheel
F–450 and F-550
2013 F-250/350/450/550 (f23)
Owners Guide gf, 2nd Printing, December 2012
USA (fus)
Towing
Rear axle ratio
3.73
4.30
3.73
4.30
4.88
255
Maximum
GCWR - lb. (kg)
19000 (8617)
22000 (9977)
19500 (8844)
22500 (10204)
26000 (11791)