https://en.wikipedia.org/wiki/Ford_Pinto#Fuel_system_fires.2C_recalls.2C_and_litigation - rear end collision fires

http://www.nytimes.com/1993/02/10/u...ying-test-was-inappropriate.html?mcubz=1 - outside "saddle" tanks

All old panel body trucks (47-55 at least), out of necessity, had the fuel tank between the frame rails near the rear of the truck.

http://www.jimcartertruckparts.com/Articles/In-Cab-Gas-Tanks.php

A little more reading for you.