Since I can remember there has always been an option to add extra fuel tanks under the trailer to extend your driving range but I have never seen this as an option for heavy EV trucks to add additional batteries under the trailer, have I missed this?
This option could theoretically double the range or more so the driver can make it home before his/her driving hours run out. No driver wants to wait 45 minutes when you are only 10 minutes from home and out of time.
With the new Swedish law allowing up to 34,5 m long so-called road trains the possibilities are endless to maximum extended range, just connecting all the batteries together.