Porsche Cayenne Owner's Manual page 234

Towing a trailer
Warning!
Driving with a trailer
f Always see the permissible towing capacity,
vertical coupling load and rear-axle load.
Please see the chapter "WEIGHTS" on
Page 356.
f When connected, the trailer must always be
horizontal behind the towing vehicle. If neces-
sary, use a trailer with an adjustable drawbar.
f When the vehicle is driven in the mountains, the
engine output decreases as altitude increases.
The maximum weights stated are the values at
sea level. The total permissable weight of the
car-trailer combination must therefore be re-
duced by 10% for each increment of 3,280 ft.
(1,000 meters) altitude. A fractional increment
counts as the full 3,280 ft. (1,000 meters).
Please take this into consideration when plan-
ning your route.
234
Trailer Hitch
Distributing the load
f Distribute the load in the trailer so that heavy
objects are as close to the axle as possible.
Always safeguard all objects against slipping
and tie them down securely.
f You should make the best possible use of the
trailer coupling's rated vertical coupling load
when loading the trailer, but never exceed it.
Tire pressure
f Select the vehicle tire pressure for full load
when towing a trailer.
f Please see the chapter "TIRE PRESSURES,
COLD (68 °F/20 °C)" on Page 354.
f Check the tire pressure of the trailer's wheels
according to the manufacturer's instructions.
Door mirrors
f If the width of the trailer obstructs your view of
the traffic behind the trailer, you must have
additional door mirrors fitted.
Headlights, lights
f Always check the headlight adjustment before
driving with a trailer.
If necessary, correct with the headlight beam
adjustment function.
f Check whether the plug of the trailer is
plugged into the towing vehicle and whether all
lights function.