Yes the Tow rating is limited to being able to effect a release if it had
the max pressure holding mechanism, as in the case of the glider kiting and
lifting the Pawnee tail.

I can't remember the name of the company right now, but they are
making SGS style tow hooks that will release under considerably more
pressure than std SGS hook. It has precision bearings in it where the
SGS is just plain metal on metal so the release friction is reduced by
multitudes of force.

-Paul