Emovis tag

I have had an Emovis tag (previously known as a liber-t tag) for many years which was invaluable on the French motorways. In 2019 I changed from my car/caravan outfit and bought a motorhome. I transferred the tag to the motorhome. The tag mostly permitted me to join the motorways but I had difficulty when exiting. I have since discovered that as the motorhome is over 3500kgs this is the reason for the difficulty. I contacted Emovis to seek an upgrade for the motorhome but was advised this was not possible. I was directed to their sister company but they only provide tags to companies for fleet vehicles.

With the increasing popularity of motorhomes I am surprised that no one has come up with a solution to this