Scania starts testing trailers which are 59 feet long and has solar panels over the roof and at both sides. Trailer is covered by 1,507 square feet of solar panels. Scania estimates an improvement in fuel economy by about 5-10%. 14,000 kWh of energy generation is expected over the course of a year. The trailer with solar panels attached can be used to power the grids when it and the truck are not in use. Link to the news: https://www.autoblog.com/2020/10/07/scania-solar-panel-tractor-trailer-semi-truck/