In 2020 I had the chance to visit the Japan Camping Car Show in Tokyo and to have a tour in motorhome in the north part of the country. Amazing experience. You can read about it on the magazine Aboutcamp BtoB: https://www.aboutcampbtob.eu/rving-in-the-land-of-the-rising-sun/
Or watch some video in the Fuori Media YouTube page. This one is related to driving in Japan: https://youtu.be/UF3kKTGXDlg