If your MH is fairly new you can get a green plakette and that allows you access to anywhere you like . We found out in Germany when our aircon was fixed in a
Mercedes garage that our Rapido (7 years old) could only get a yellow one so did not bother since most places only allow green . However a friend of ours has travelled and stayed in many cities in Germany over the last 3 years and did not even know he needed one since nobody has stopped him . Personally we are not too bothered since big cities are not great to take a MH into at the best of times.