Just in case anybody cares, the show that ran the footage of the Chev truck exploding on impact due to the side tanks later admitted that, for effect, they used explosive charges to ignite the tanks "just in case they didn't blow". I remember when they were forced by GM to make a public apology on a later show. Does anybody remember which show(60 minutes or one of those?) pulled the stunt?
In addition, I've seen lots of pickups with side tanks in accidents that haven't exploded. And how many 70's cars with the tank way in the rear didn't blow when they were rearended?