Eh, I have the advantage of mercs. So no biggy.
Mich, you cant leave mercs in an encounter, you have to log off to get them to stay.
Also, people use car thief alts to search around the fortress and other areas like san fran all the time. you'll see that car go poof really fast if you leave it in those areas.
Between myself and my friends we've found at least 8 or more cars within the space of a week or two just by searching the usual spots where people park to trade.
In short mich, you plan is fail.
-Ulrek-