There’s been some ideas floating around to give semis a “fuel car” with CNG tanks to give them the range they need. It would hook up between the semi and the trailer. I suppose it’s no worse than the double bottom trash haulers that tear up Detroit’s highways.
CC
Development on the fuel tank front has been fast and furious over the past year. Just last summer, we reported that Freightliner was boasting fuel tank range of up to 700 miles with a back-of-cab and saddle tank system capacity of 115 diesel-gallon equivalents. A year later, Carrick says he can build a system with a range of 1,200 miles.
“I can give you dual 45-gallon CNG tanks on the rail and 155 back of cab,” he says. “With capacity of 245 gallons of fuel, you’ve got a range of 1,200 miles.”
http://www.truckinginfo.com/article/story/2014/09/natural-gas.aspx