PEUGEOT RCZ Handbook page 192

Cooling
Towing a trailer on a slope increases the temperature of the coolant.
As the fan is electrically controlled, its cooling capacity is not dependent
on the engine speed.
To lower the engine speed, reduce your speed.
The maximum towing load on a long slope depends on the gradient and
the ambient temperature.
In all cases, pay attention to the coolant temperature.
If the warning lamp and the STOP warning lamp come
on, stop the vehicle and switch off the engine as soon as
possible.
Braking
Towing a trailer increases the braking distance.
Tyres
Check the tyre pressures of the towing vehicle and of the trailer,
observing the recommended pressures.
Lighting
Check the electrical signalling on the trailer.
The rear parking sensors will be deactivated automatically if a
genuine PEUGEOT towbar is used.
When not towing a trailer, remove the quickly-detachable tow ball
before driving, so as to avoid masking the central rear lamp.