Is there a higher chance of a cab fire in the event of a roll over with a fuel cell mounted behind the cab VS. mounted at the back of the frame? I assume the risk is the same if the cells are properly installed. I assume mounting a cell at the back of the frame will just buy the driver and co-driver a few more seconds if disaster strikes. Any advantages to either mounting location other than the obvious, more weight in the back? But then again, all that weight from in the back from the full cell goes away as gas is used.