On Post Road (US Rte 1) right in front of the North Kingstown Fire Department. see here. I was sjocked to see it still there, though I've never seen it in person. I was "driving" around on streetview and stumbled across it. South County is FULL of old mercs and older HPS too.
follow down this road on street view. Then follow down this road and you'll see nearly 20 OV-10IBs!