Honestly, at some point I lost a bit track of where and when the games took place.. Tharkas is more or less based on the Mojave from fallout 3, thats why he is equipped with a Automatic Rifle instead of all the new energy based weapons.. I was thinking that he basicly just lived day by dav, wandering around from place to place so that he never stay the same place too long, and eventually end up around where we are now