I was sneaking around the Foundation tonight trying to learn the zone, and found Trag up.
Standing on top of his head, he was at loc -354, +1796, -213. Standing in one of the little ditches in the starfish shaped room on the west side of zone.
I assume the previous poster was saying to set up camp in the northern tunnel that connects the starfish shaped room to the westmost room on the map, since it is empty and no wanderers. If you camp there, you would have a pretty long & crowded pull to get him to camp from where he is tonight.
Edited, Mar 11th 2010 10:46pm by Kiresretaw