have you ever looked at the configuration of most small cars, almost
all of them have their seat backs beyond the rear axle. I'll gran the
point about seat clearance from the rear but I don't believe that too
many SUVS are like that, I know that the expedition has almost 18
inches between the seat back and the rear plus another 6+ inches of
bumper give well over 2 feet of clearance. If an impact is so strong
that it would affect a passenger 2 feet from the rear, it would be bad
for the passenger no matter what vehicle was involved.
next strawman step forward