While these pictures are of a TW200, the way all of our racks attach will strengthen your sub-frame by turning it into a Truss if you will.  The picture below was where one of our customers was rear ended by a van.  Our rack prevented the sub-Frame from collapsing and probably saved his life.  You can see the integrity of the rack was not compromised given the force of the impact.

On the picture below, a customer went off the trail.  His bike went end over end for over a 100 ft and into a tree.  You can see the damage to the rack was minimal given the circumstances.  A wrecker used the rack to retrieve the motorcycle.