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http://opensfhistory.org/Download/wnp27.6626.jpg

Kidding.

Yes that's the real question, the recent Engineering Explained video on hydrogen cars gave me a good amount of concern that viable hydrogen cars require careful consideration of how much hydrogen they can store on board, and so they can easily be compromised.

Now I want someone to attach a large blimp shaped balloon emblazoned with explosive hazard warnings with a fake line going into the car labeled "prototype hydrogen car" and drive around and film it.

Rough guess (based on info here: https://demaco-cryogenics.com/blog/energy-density-of-hydroge...) if stored at 700bar is 400L.

Which doesn't sound right. Can someone correct me please?

Well, smaller than the envelope of the car, but that's all we can guess at this point.

What immediately came to mind was a dirigible. I'm hoping that's not really the case.