Ford 2003 Mustang Owner's Manual page 122

Driving
When towing a trailer:
Use D (Drive) or a lower gear when towing up or
down steep hills. This will eliminate excessive
downshifting and upshifting for optimum fuel
economy and transaxle cooling.
Anticipate stops and brake gradually.
Servicing after towing
If you tow a trailer for long distances, your vehicle
will require more frequent service intervals. Refer to
your maintenance guide and or service guide for
more information.
Trailer towing tips
Practice turning, stopping and backing up in an
area before starting on a trip to get the feel of the
vehicle trailer combination. When turning, make
wider turns so the trailer wheels will clear curbs
and other obstacles.
Allow more distance for stopping with a trailer
attached.
The trailer tongue weight should be 10% of the
loaded trailer weight.
After you have traveled 80 km (50 miles),
thoroughly check your hitch, electrical
connections and trailer wheel lug nuts.
When stopped in traffic for long periods of time in
hot weather, place the gearshift in P (Park) and
increase idle speed. This aids engine cooling and
air conditioner efficiency.
Vehicles with trailers should not be parked on a
grade. If you must park on a grade, place wheel
chocks under the trailer's wheels.
Towing your vehicle behind another vehicle
At times, you may want to tow your vehicle behind
another vehicle, such as a recreational vehicle, car
or a truck.
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