Our depot Geneva is located in Vulbens (France), very close to the border with Switzerland. Therefore, there are specific regulations in place for Swiss nationals that are renting a campervan need to be aware of. According to the Federal Customs Administration of Switzerland (https://www.ezv.admin.ch/ezv/en/home/information-individuals/road-vehicles-and-watercraft/importation-into-switzerland/unverzollte-fahrzeuge-voruebergehende-in-der-schweiz-benutzen.html): "In principle, you may not use an uncleared vehicle in Switzerland. You must spontaneously declare any vehicle(s) on which duty has not been paid for permanent importation into Switzerland to Swiss Customs at the border. (...) You have to ask Swiss Customs for a temporary certificate form 15.25 for the vehicle when entering Switzerland. You can get this at all manned border crossings during opening hours in tourist traffic. With the temporary certificate form 15.25, you have eight days (from the beginning of the rental contract) to re-export the vehicle or return it to the rental company based in Switzerland. If you arrive in Switzerland more than five days after the start of the rental contract, the customs office will issue you with a temporary certificate form 15.25 for three days. You must be able to present the rental agreement concluded with the rental company at all times." Following these rules is fundamental, as not doing so can result in a significant fine. Be aware of the opening hours of the manned border crossings, and make sure you do not enter Switzerland without the temporary certificate form 15.25.