RE: "From what ive read, impacts hard enough to bust an in-cab tank and start a fire are hard enough that the driver of the truck wouldnt care because you would be dead. Use the search function to look up more debates on this."

... this echoes a lot of what I've aready read on this. The way I see it a fella could put a tank under the bed in the rear, have it blow getting plowed from behind, and wish he'd put it be behind the seat. Who knows?