There real cost of fuel cell are the hydrogen filling stations set up. There is a new type of fuel cell this wil be in the market within this year that you don't need hydrogen for. The fueling system is very easy to install and has no need for high pressure system and can be stored in regular plastic tanks. This could be gravity fed or by a electric pump. The only by product of this fuel cell is water. The cost of these trucks will be comparable with trucks in today's market for either diesel electric or LPG.
These trucks will be 100% Zero emission and have the same range as a diesel truck and the same refueling time
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