That would raise the center of gravity a lot though. I have to think if they did a real design they could manage like honda to get it down and out of the way. Why can't they stick it between the frame rails. Seriously look gasoline is very energy dense and you don't need a ridiculous high pressure tank. Put the CNG where the gas tank is an a much smaller gas tank somewhere else. There are gas stations all over. You don't need the range on gas that most vehicles have. Then a person can use CNG, the bed, and gas if they need it.