Hmm Lets make the entire car a crumple zone...

I think it depends on the truck involved.

The tests do not show the height difference and its effects on crashes. When a taller vehicle hits a shorter car it will likely hit at a higher spot on the car than where it was designed to take the impact. It’s a big mismatch that is becoming less and less of a problem with new designs. Presumably the SUV will sustain less damage given that it doesn’t roll over on top of itself.

The bottom line is,

  1. how well the passenger compartment is protected
  2. the forces on the passengers

The video of the Volvo shows that the dummy is very, very well controlled.