Mercedes-Benz SLK-Class 2008 Owners Manual - Manual (Page 253)

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Roof rack
!
This vehicle is not designed to carry items
on its roof. Roof rails and any roof-mounted
devices, unless expressly approved by
Mercedes-Benz for use on this vehicle model,
must not be used as they will damage the vehicle
and retractable hardtop.
At time of printing, Mercedes-Benz does not
offer any roof racks or any other roof-mounted
devices for use on this vehicle.
! This vehicle is not designed to carry any
items on its trunk lid or accommodate any type
of trunk lid rack or device. Using such devices
may damage the vehicle and retractable hardtop
mechanism.