they probably are. they can consider just refueling - PLUG delivers liquid hydorgen to the facility which stores and dispenses like a distribution center but its trucks at 700 bar not forklifts to have a 1MW electrolyser installed would be the next step up with a lot more balance of plant required for the water and electric feed.
Amazon seem to be considering it so fleets could be asking questions at least
News 
Market Data 
Discover 
