I never really understood what fuel cells have to do with hydrogen, and why it’s a more appealing form factor than removing a vehicle’s gas tank and instead just putting in a manifold with room for a number of some standard of gas can with valves fitted. It’s not an inherently “hydrogen” thing.

Besides, it’s fully possible to set up a bunch of gas cans from a truck in the same way you could set up a bunch of hydrogen “fuel cells”.