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I did find this regulation regarding towing: https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32012R1230
I don’t know if any other European regulations regarding the maximum unbraked weight predate this one.
Thank you! That one also showed that they test with all tanks filled to a minimum of 90% and all manufacturer equipment provided. Which was nice to see the specificity on ensuring testing was done with a full vehicle and trailer!
You’re welcome. These regulations are usually quite specific, and if something is missing, it usually gets added in a later revision.