See also:

Mercedes-Benz M-Class Owners Manual
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Folding the seat backrest forward
i Vehicles with memory function: when you fold one or both parts of the rear seat backrest forwards, the respective front seat moves forward slightly, when necessary, in order to avoid conta ...

Securing hooks
Only use the mounting hooks to secure items of luggage up to maximum of 9 lbs (4 kg) in weight. There are two securing hooks 1 on each side of the cargo compartment. ...