There have been people on this board that have been rear ended. In none of those cases was there any intrusion into the cabin. An accident will be nasty no matter what the circumstances. I feel pretty confident based on the fact that the VX is built on a strong truck frame. If someone has some pictures or other data to refute my beliefs, please post them here.
Besides, US Van does this kind of customization for a lot of vehicles and road safety is a big deal for them. They wouldn't put a seat in rear-facing as they said that was a big safety problem.
I would also like to point out that I now have seat belts for all occupants instead of just four - so I feel a ton more safe knowing that they have seat belts. An occupant that is not tethered down will have some major injuries in an accident, no matter what the car.
Brent