Mercedes-Benz 2016 Metris Operator's Manual page 242

Carrier systems
240
You will find information about the maximum
roof load and maximum tailgate load under
"Cargo tie-down points and carrier systems"
( page 305).
Y
!
Make sure that:
the screws of the roof carrier are tightened
R
to a maximum torque of 7.4 lb-ft (10 Nm) in
the threaded holes provided and
there is a minimum bolt penetration of
R
4 turns.
Only install roof carriers and rear racks that
have been approved or recommended for
Mercedes-Benz vehicles. This will help avoid
damage to the vehicle.
You can install a roof carrier on the roof and, for
example, a rear-mounted cycle rack on the tail-
gate.
Install the protective caps on the securing
threads after you have removed the roof carrier.
If you have installed a rear rack on the tailgate,
the additional weight reduces the assistance
provided by the gas pressure springs when the
tailgate is opened. You will then need more force
to open the tailgate. At low outside tempera-
tures below freezing you will need to provide
extra support for the tailgate to prevent it from
sinking unintentionally.