Ford Vehicle Owner's Manual page 252

If necessary, add weight to the rear of the
vehicle or bed to obtain the above and to
comply with U.S. Federal Hydraulic Brake
Requirements, when aftermarket equipment is
added.
The Front Axle Accessory Reserve Capacity
and the Total Accessory Reserve Capacity
listed on the Safety Compliance Certification
Label will help you to determine if the
addition of a snowplow will overload the
vehicle. The total of the weights of all
aftermarket accessories added to your vehicle,
plus the weight of the snowplow, must not
exceed the Total Accessory Reserve Capacity.
Additionally, the portion of these weights
distributed to the front axles must not exceed
the Front Axle Accessory Reserve Capacity.
The weight of the snowplow and related
equipment should be properly matched to the
load capacity of your vehicle. The weight of
the installed equipment must not load the
vehicle beyond the GAWR and GVWR listed
on the Safety Compliance Certification Label.
Permanently attached plow equipment should
not exceed 270 lbs. (122 kg). The weight of all
installed aftermarket equipment should not
exceed 680 lbs. (308 kg).
Equip your vehicle with lights that conform to
Federal and local regulations for snowplowing.
See your dealer for the correct type of wiring.
Do not plow snow until your vehicle has been
driven 500 miles (800 km). Maintain the vehicle
and snowplow equipment in accordance with
their respective manufacturer's recommendations.
Refer to the notes under Scheduled Maintenance
Services when plowing snow for extended
periods.
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