Welcome to MBClub and congratulations on your new car.
Factory fitted tow bars were not standard however as your car has already been built, then someone must have decided the spec at some point - even if it was ordered for stock - and so there is a small (but unlikely) possibility that they may have specified an optional factory fitted tow bar.
If you have ordered it from a main dealer then they will be able to confirm the specification from the VIN number. Main dealers can retrofit tow bars however they do very few of them as their labour rate and use of Mercedes original parts means that they cost much more than an independent tow bar specialist.
As a result it’s commonplace that main dealers who do fit tow bars actually subcontract it to an independent tow bar specialist to either perform at their premises or in the car park of the main dealer, but charge main dealer rates. This enables them to charge a margin and keep the workshop bay free for other work.
It sounds like your main dealer has decided not to do it at all. If you reply with the name of your nearest town then a member will advise you of reputable tow bar specialists in your area. In the meantime call some specialists in your area - based upon a Google search or yellow pages - and gather some quotes for them to supply and fit.
Personally I would only fit Westfalia tow bars, and regardless of the tow bar manufacturer I would insist on a wiring kit so that the fitter does not have to cut the cables in your car. Again personally I would insist that they only use a Westfalia wiring kit or one supplied by a Mercedes wiring kit supplied by a Mercedes main dealer parts counter..
This may be a little more expensive than cutting the wires or using a generic wiring kit but reduces the likelihood of the installer cutting corners and causing issues which affect your new car and void the warranty. In any case the warranty would only be void for any issues which could be caused by the tow bar being retrofitted.
Finally, and most IMPORTANTLY a car must be “type approved” for towing in order to legally use a tow bar in the UK Europe, even if only for the purposes of a cycle rack. If your particularly model has not been type approved then reputable tow bar fitters would not fit a tow car so you need to check ASAP.
Ask the main dealer to confirm whether your specific car is type approved for towing AND ask them to send you a photo of the VIN plate from your specific car which will show the type approved weights - it will look like the one below. If you reply to this thread with the details then a member will confirm whether it is type approved.
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