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trailer load. If either the vehicle or the trailer is
fully laden, the permitted gross vehicle weight or
the permitted trailer load values are reduced
accordingly. In this case, you may only partially
load the trailer or the vehicle.
The gross trailer weight (GTW) is calculated by
adding the weight of the trailer to the weight of
its load and equipment. If the trailer is equipped
with a separate braking system, the permissible
gross trailer weight is 5,000 lbs (2,268 kg).
The maximum drawbar tongue weight on the ball
head (TWR) is 500 lbs (227 kg). However, the
actual tongue weight must not exceed the value
given on the trailer hitch or trailer identification
plates. Where the values differ, the lowest shall
always apply.
The gross combined weight rating (GCWR) is cal‐
culated on the basis of the gross trailer weight
plus the gross vehicle weight, including a driver's
weight of approximately 150 lbs (68 kg). The
maximum permissible gross combination weight
is vehicle-specific and equipment-dependent.
When driving with a trailer, you should not exceed
the maximum permissible gross combination
weight rating (GCWR).
The permissible values, which must not be excee‐
ded, can be found in your vehicle documents and
on the identification plates of the trailer hitch, the
trailer and the vehicle. The values approved by
the manufacturer can also be found in the "Tech‐
nical data" section. Where the values differ, the
lowest shall always apply.
Loading the trailer
Use a tongue weight that is as close as possible
to the maximum permissible tongue weight. Do
not undershoot the minimum permissible tongue
weight. Otherwise, the trailer may become
detached.
Distribute the load over the vehicle and the
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trailer so as not to exceed either the maxi‐
mum 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 permissi‐
ble 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
Driving and parking 135
ensure that you do not exceed the permissi‐
ble gross vehicle weight rating (GVWR).
Checking vehicle and trailer weight
Make sure that the weights of the towing
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vehicle and the trailer comply with the maxi‐
mum permissible values. Have the vehicle/
trailer combination weighed on a calibrated
weighing machine. The vehicle/trailer combi‐
nation comprises the towing vehicle including
driver, passengers 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).
Trailer power 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 qualified 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
electrical 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 off when the vehicle's on-board
electrical system voltage is low. This could com‐
pletely discharge your vehicle's starter battery.
Further information on the electrical equipment
currently installed on your vehicle and on instal‐
ling the trailer electrics can be obtained at a
qualified specialist workshop.
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