Nikola motors is trying to use hydrogen for a semi with an electric drive, but they were also talking about natural gas too. I’m not a big fan of the tech, but I know where they are coming from. Im not sure with the higher density batteries coming out whether hydrogen will be viable by the time the tractor is done.
With driverless semi’s already being tested, I am kind of guessing charge times actually aren’t going to matter. The tech Proterra is using for buses charges -fast-, provided you can get the current there.