At temperatures below 45 º F (+7 º C), summer tires lose elasticity significantly, and therefore traction and braking power as well.
Change the tires on your vehicle to M+S tires. Using summer tires at very cold temperatures could cause cracks to form, thereby damaging the tires permanently.
Mercedes-Benz cannot accept responsibility for this type of damage.
Problems with the SmartKey
...
Traveling uphill
Approach/departure angle
WARNING
If you drive on a steep incline at an angle or
turn when driving on an incline, the vehicle
could slip sideways, tip and rollover. There is
a risk of an accident. ...
Notes on towing a trailer
Important safety notes
WARNING
If you install a ball coupling other than the one
delivered with the vehicle, the trailer tow hitch
and the rear axle may be overloaded. This
applies especially if ...