All hydrogen fuel cell vehicles use small batteries to buffer charge to actually drive the electric motors because the fuel cell power output isn't high enough.
73kWH isn't huge for a large truck, equivalent to current small passenger EVs.
For a vehicle whose fundamental purpose is to haul heavy freight, the excess weight imposed by batteries is uneconomical, which is a why fuel cells make sense - especially when the H2 is renewably generated.
All hydrogen fuel cell vehicles use small batteries to buffer charge to actually drive the electric motors because the fuel cell power output isn't high enough.
73kWH isn't huge for a large truck, equivalent to current small passenger EVs.
For a vehicle whose fundamental purpose is to haul heavy freight, the excess weight imposed by batteries is uneconomical, which is a why fuel cells make sense - especially when the H2 is renewably generated.