Pretty sure that EV semis get an extra 2k lbs of gross to work with now:
Battery trucks are just ok for short range stuff now. But in the bigger picture, hydrogen is what most of the commercial heavy duty sector is investing in for extreme duty cycles. Initially (within 5 years) it will be in the form of ICE's that burn hydrogen. These will share many components with ICE powertrains that we're used to right now, so it will be relatively easy to develop, implement into trucks, and relatively inexpensive to purchase. If that takes off in any significant way, then hydrogen fueling stations will become more common, and eventually hydrogen fuel cells might become more financially viable. These companies are investing tons of money into hydrogen as are many governments around the globe including the US. The people making big decisions know that batteries can't do it all.
I'm of the mindset that in the future batteries will be useful in applications that gasoline currently works for, and hydrogen will probably be the diesel equivalent. Perhaps eventually replacing batteries all together if fuel cells reach a point of reasonable affordability.