Mercedes-Benz Metris Operator's Manual page 135

Distribute the load over the vehicle and the
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trailer so as not to exceed either the maximum
permissible values for the gross vehicle weight
rating (GVWR) and gross trailer weight (GTW),
the gross combination weight rating (GCWR),
or the maximum permissible gross axle weight
rating (GAWR) and tongue weight (TWR) of your
vehicle.
Add the rear axle load to the drawbar tongue
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weight (TWR) on the ball head. This will ensure
that you do not exceed the permissible gross
axle weight rating (GAWR).
Add the vehicle load to the drawbar tongue
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weight (TWR) on the ball head. This will ensure
that you do not exceed the permissible gross
vehicle weight rating (GVWR).
Checking v Chec king vehicle and tr ehicle and trailer w ailer weight
Make sure that the weights of the towing vehi-
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cle and the trailer comply with the maximum
permissible values. Have the vehicle/trailer
combination weighed on a calibrated weighing
machine. The vehicle/trailer combination com-
prises the towing vehicle including driver, pas-
sengers and load as well as the laden trailer.
Check the maximum permissible gross axle
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weight rating of the front and rear axles
(GAWR), the gross trailer weight (GTW), the
gross combination weight rating (GCWR) and
the drawbar tongue weight (TWR).
T T r r ailer pow ailer power supply er supply
Incorrect cabling of the connector plug may inter-
fere with other electronic systems in the vehicle.
Mercedes-Benz therefore recommends that you
have the cabling of the connector plug carried out
at a quali ed specialist workshop.
You can connect accessories up to a maximum of
240 W to the permanent power supply. Do not
charge a trailer battery using the power supply.
Your vehicle may be equipped with a range of elec-
trical equipment for trailer operation. Depending
on your trailer, you may need an adapter for the
electrical connection between the trailer and your
vehicle.
The trailer socket of your vehicle is equipped with a
permanent power supply at the factory.
The permanent power supply is supplied via trailer
socket pin 4.
Note that the trailer's permanent power supply is
not switched o when the vehicle's on-board elec-
trical system voltage is low. This could completely
discharge your vehicle's starter battery.
Further information on the electrical equipment
currently installed on your vehicle and on installing
the trailer electrics can be obtained at a quali ed
specialist workshop.
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Driving and parking 133
133