William “Trey” Nelms II and David Brasells demonstrate two techniques in this video. Both start by removing the rear door with spreaders, but diverge in where they cut the B-post or B-pillar after that. The results are the same, though – turning the entire side of the car into a door.
Needless to say, you’re won’t need to use these techniques at every vehicle accident. Just like in forcible entry, try the door before you start cutting and wrenching things. If you can open it, then you can leave the saws, spreaders and cutters on the truck.