ohh we forgot that every handful of years the
Hydrogen cylinder(s) will have to be hydrostatic tested(placed in a pool of water for cylinder expansion), and the cylinder(s) will weigh a "ton" as the result of DOT requirements for safety, and the owner of the vehicle will not be able to do a DIY on her/his own car, so the process may cost one-thousand or two...
It will feel like having to put a new engine in a car every other year or so.
But their is relief!!!! The first five years no testing is required...
To much pain....
Lets do EV all the way...
Martin