When you’re talking strictly about head on collision, you can’t escape the law of physics (F=MA), Force = Mass x Acceleration. The one with more mass will always win. FLU, mass doesn’t always mean CUV though. A lot of the Mid-size luxury sedan weight 4000+lb as well, so I think they fair just as well as a CUV would w/out the risk of flipping over on an off angle head on collision. Off angle head on collision is probably more likely than an direct head on collision in real life (IMHO). People will always try to swerve to dodge a collision.