As well as requiring a spherical tank ( Thick walled cylindrical with spherical heads can also be used ) one should indicate the internal pressure of this tank, from Google
Storage of hydrogen as a gas typically requires high-pressure tanks (350–700 bar [5,000–10,000 psi] tank pressure). Storage of hydrogen as a liquid requires cryogenic temperatures because the boiling point of hydrogen at one atmosphere pressure is −252.8°C.
Currently people who live in aprtments and condominiums, do not allow vehicles that do not run on petrol. Propane and natual gas driven vehicles have been banned. Natural Gas ( CH4), Methane, propelled vehicles was promoted in the past, but never took hold, because of these restrictions, Insurance costs, and people's feasrs for sitting on a "bomb" .
When comparing the mass of fossil fuel-powered vehicles to electric vehicles, one must also consider the weight saved in electric vehicles related to the fact that electric motors are lighter than internal combustion engines and electric vehicles do not need a heavy transmission, a water filled radiator and other auxiliary parts.
@fflipp I agree, the topic is more complex than I've covered here. I am also interested in the reduced maintenance requirements of electric vehicles - there will be far fewer moving parts to wear out!