Mercedes-Benz SLR McLaren. Operator's Manual.

Certification label
Even after careful determination of the
combined weight of all occupants, cargo
and the trailer tongue load (if applicable)
( page 263) as to not exceed the permissible
load limit, you must make sure that
your vehicle never exceeds the Gross Vehicle
Weight Rating (GVWR) and the Gross
Axle Weight Rating (GAWR) for either the
front or rear axle. You can obtain the
GVWR and GAWR from the Certification label.
The Certification Label can be found
on the driver’s door A-pillar, see “Technical
data” ( page 368).
Gross Vehicle Weight Rating (GVWR): The
total weight of the vehicle, all occupants,
all cargo, and the trailer tongue load
( page 263) must never exceed the
GVWR.
Gross Axle Weight Rating (GAWR): The total
allowable weight that can be carried by
a single axle (front or rear).
To assure that your vehicle does not exceed
the maximum permissible weight
limits (GVWR and GAWR for front and rear
axle), have the loaded vehicle (including
driver, passengers and all cargo and, if applicable,
trailer fully loaded) weighed on a
suitable commercial scale.
Operation
Tires and wheels
Trailer tongue load
The tongue load of any trailer is an important
weight to measure because it affects
the load you can carry in your vehicle. If a
trailer is towed, the tongue load must be
added to the weight of all occupants riding
and any cargo you are carrying in the
vehicle. The tongue load typically is ten
percent of the trailer weight and everything
loaded in it.
Your Mercedes-Benz has been designed
primarily to carry passengers and their
cargo. Mercedes-Benz does not recommend
trailer towing with your vehicle.
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