Vauxhall COMBO Owner's Manual page 168

The p ermissible carav an/trailer load
applies up to the specified incline and up to
an altitude of 1000 m etres above sea level.
Since engine power decreases as altitude
increases because the air becomes thinner
(thereb y reduc ing climbing ability), the
permissible tow ing weight also decreases
by 10% for ev ery 1000 metres of additional
altitude. The towing weight does not have
to be reduced when driving on roads with
slig ht inclines (less than 8%, e. g.
motorways).
166
The actual carav an/trailer load plus the
actual gross vehicle w eight must not
exc eed the m aximum p ermitted towing
weight. For example, if the permitted gross
vehicle weig ht is utilised, the trailer/
caravan load must only b e used until the
maximum permitted towing weight is
reached . The maximum permitted towing
weight is shown on the id entific ation p la te
– see page 226.
Coupling socket load
The coupling socket load is the load
exerted by the trailer/carav an on the
coupling ball. It can be va ried by changing
the weight distribution when loading the
trailer/caravan.