Posted: Wed Nov 22, 2023 8:45am
Forget what happens in UK, it's irrelevant.
In Spain you can only fit a genuine a vehicle manufacturers towbar which will come with papers and bear it's own homologation plaque, anything else will fail an ITV. If Mercedes want €3600 for that then so be it, you have no other choice.
I don't know for sure but it's quite likely that whatever you plan to attach to the tow bar will need to be certified also.
Even when fitted you must submit the vehicle to an ITV station for it to be added to the cars documents. This applies whether the car is old enough to require an ITV or not.