you guys are comparing apples to oranges here. Don't forget when you wreck a race truck you are more than likely sporting a 5 point harness, helmet, and neck brace. When you get in a wreck in a car you are only wearing a 3 point harness, if even that. Most car seatbelts are half as thick as the 5 point harnesses, so the body weight from your impact will not be as distributed as well as the 5 point harness. Most race trucks are not sporting all of the crap that people carry with them on a daily basis either so it is not like you will be getting hit in the head with a can of beans you just picked up from the store.
The worst thing for any accident is if you see it coming. Your body stiffens up and that is when bones get broken, this is why most drunks walk away from accidents... the are loose. I could not imagine clinching on the steering wheel and trying to use my wrist to support all of my body weight and the momentum from the accident. Only to have your clinched wrist blown outward by an air bag.
I would take a hit in a well built race car/truck with all of my safety gear on over a daily driver any day. But how often are you sporting around town with all of your gear on and wearing a 5 point harness?