Opel Corsa Owner's Manual page 194

188 Driving and operation
The permitted caravan/trailer load applies
up to the specified incline and up to an
altitude of 1000 metres above sea level.
Since engine power decreases as altitude
increases because of the air becoming
thinner, therefore reducing climbing ability,
the permitted towing weight also
decreases by 10 % for every 1000 metres of
additional altitude. The towing weight
does not have to be reduced when driving
on roads with slight inclines (less than 8 %,
e. g. motorways).
The permissible gross train weight must not
be exceeded. This weight is specified on
the identification plate 3 250.
Coupling socket load
The coupling socket load is the load
exerted by the trailer/caravan on the
coupling ball. It can be varied by changing
the weight distribution when loading the
trailer/caravan.
The maximum permitted coupling socket
load (vehicles with engine Z 12 XEP: 45 kg,
other versions: 55 kg) of the towing vehicle
is noted on the identification plate of the
trailer towing device and specified in the
vehicle documents. This must always be
complied with, particularly when towing
heavy trailers. The coupling socket load
must never be less than 25 kg.
When measuring the coupling socket load,
make sure that the drawbar of the loaded
trailer/caravan is at the same height as it
will be when the trailer/caravan is coupled
with the towing vehicle loaded. Particularly
important for trailers/caravans with
tandem axle.
Rear axle load during towing
With the trailer attached and the towing
vehicle fully loaded, including all the
passengers, the permitted rear axle load
(specified on identification plate and vehicle
documents) for passenger vehicles may be
exceeded by 45 kg and the permitted total
load may be exceeded by 50 kg.
For vans the permitted rear axle load may
be exceeded by 25 kg. The permitted total
load may be exceeded by the following
amounts with the engines specified below:
Z 10 XEP 30 kg
Z 12 XEP 15 kg
Z 13 DTH 40 kg
Z 13 DTJ 35 kg
Trailer operation is not permitted for vans
with tyre size 215/45 R 17.
If the permitted rear axle load is exceeded
a maximum speed of 100 km/h applies. If
lower national maximum speeds are
specified for trailer operation, they must be
complied with.
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