It was me. There are 2 spots, Villas Aragon motel and Baleanario San Juan. The later may be a bit less secure if you are alone as it is up a bit of a remote road, but they do lock you in at night. For a single rig I would use a motel Aragon. I need to look up the coordinates but if you search for that name here you should find my original post. The swimming pool complex might have a night watchman this time of year as it will be open to the public. In Jan it was pretty quiet. I had a caravan in there and the police supplied us with an overnight police presence.
On edit
http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28634055/gotomsg/28634421.cfm#28634421Coordinates for both locations are in that thread