Those Austrians are so helpul!So yeah, retrofitting a tow hitch for an European Model X is possible, if you are willing to drive to Austria.
I thought that you wanted Tesla to produce a document saying that a non-factory hitch installed onto your car could tow a certain amount of weight.
My apologies for misinterpreting your post!
It does seem reasonable that, for an X without a factory tow hitch, if Tesla installs a factory hitch the owner could ask for a formal document from Tesla about what the car can then tow. But that information is already in the Model X user manual, right?