Tom,
You are correct about the higher deceleration forces of a lighter
vehicle when it crashes head on with a heavier vehicle, due to the
larger inertia of the heavier one.

But it does not mean that the occupants of the heavier are safer, as
their structure may experience more damage, so it's hard to really
tell what would happen and I would say one would have to examine the
overall safety and design of each vehicle, like we compare the sink
measurements of each glider. An ASW 17 for instance is not necessarily
better than an 18 Meter ship, etc....or even perhaps a 15m Diana -2 at
certain speeds.

http://www.bridger.us/2002/12/16/Cra...operVsFordF150

Size is not all that matters but design. And yes, I meant
brakes.........my bad......