San Fransisco is pretty much barren. There are shops in the Boneyard area that also don't get a lot of traffic. The gunrunner fortress has a lot of people that come by it, but probably won't have thieves camping there.Trade in unguarded towns, so that you can kill anyone that walks up to you. And, a thief-alt wouldn't be in an unguarded town:Broken Hills is quite congested during the day, from miners to mine-campers to people camping besides the militia, so don't go there. New Reno is actually pretty good, but you have to be really careful about not leaving any traces that would lead someone to you. Den has some traders with good stuff, and the Gunrunner Fortress isn't very crowded at all either.
New Reno is actually pretty good, but you have to be really careful about not leaving any traces that would lead someone to you.