> Therefore nothing suggested so far is going to work. It might be a radical idea, but there is usually an industry association for any domain, at the international, regional, and country level and they frequently publish marketing and production and sales statistics which use sectors and terminology aligned aligned with their consumers and suppliers.
See https://www.prnewswire.com/news-releases/global-recreational-vehicles-industry-300508184.html - "... Classification of Recreational Vehicles differs across major geographical markets, in accordance with consumer lifestyles and requirements. The US and Canadian markets are analyzed by the following Segments: Motor Homes (Class A, Class B, and Class C), Travel Trailers (Conventional Travel Trailer, and Fifth Wheel Travel Trailer), and Campers & Camping Trailers (Folding Camping Trailer, and Truck Camper). The Japanese market is analyzed by the following Segments: Trailers, and Others, while the European market is analyzed by the following Segments: Motor Caravans, and Touring Caravans. The Asia-Pacific market is analyzed by the following Segments: Caravans, and Camper Vans. The report provides separate comprehensive analytics for the US, Canada, Japan, Europe, Asia-Pacific, and Rest of World." Also RV Industry Association https://www.rvia.org/who-we-serve , https://www.rvia.org/news-insights/rv-shipments-november-2018 , https://www.civd.de/en/association.html https://www.civd.de/en/association.html , The European Caravan Federation (ECF) http://www.e-c-f.com/index.php?id=3 , KCI (Dutch Association for Camping and Caravan Industry) If it has a large footprint in the world, it is probably regulated and / or monitored by some international organization and various country's governmental agencies. "415 drain see also ditch... Conduit or small open channel by which water is removed from a soil or an aquifer, by gravity, in order to control the water level or to remove excess water." in the International Glossary of Hydrology from the World Meteorological Organization and United Nations Educational, Scientific and Cultural Organization ( http://www.wmo.int/pages/prog/hwrp/publications/international_glossary/385_IGH_2012.pdf ). Frequently they will have crosswalks or otherwise note the differences and similarities between different regions and countries. Michael Patrick Data Ferret
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