Jeff-
I've got an 01 passat, and the tow loop is hidden behind the slotted trim piece below the bumper in vertical line with the headlamp. Not sure if there is more than one, but the one we use is on the passenger side. Our trim piece got lost in a fender bender, but it looks like it just snaps in, and that you could tie a piece of webbing through the tow loop, slide it through the trim piece and then tie another knot to keep it from sliding back. You don't normally want much pressure on the front and or rear ties (why the sell ratcheting ties for this is beyond me), but you want it strong enough to keep the stuff on top of the car from leaving should a catastrophic rack failure happen.
Phil