2 things I see -
1) I would be careful when you post logs. If any of the directories like the HB, profile or Mesh path includes identifying info, then I would *snip* that portion out. (hint - maybe you should edit your log and re post it?)
2) It looks like in this case it was having problems with Fiona's Caravan quest but I could be wrong on that. I can't do research on the quest right now cause I can't go to wowhead and other game sites. (they haven't included these forums... yet... lol)
It could be a Wow addon that's conflicting as well... try turning all of them off and running it for awhile.