Not an Equinox, but our Terrain (sister to Equinox...only different sheet metal) tows perfectly. I did install a switch in place of the required fuse that has to be removed, but other than that, no other modifications were required. Turn the key to Acc, flip the switch, put the trans in neutral and off we go.
We now have about 20,000 miles towing and 90,000 miles total and the car has not had ANY problems what so ever.
Highly recommend either the Equinox or Terrain.
Ron