Thought I'd mention it here, since it's hard to find much on this.
I just leveled Deshavi and gave her Tracking 6. Before, when she had Tracking 5, tracks notified me if they were from a war party, bandits (and which kind of bandits) and some other party types, but not caravan. Caravan tracks just gave the size and hour. After I gave her Tracking 6 I now see that caravan tracks reveal they were left by a caravan.
I'm pretty sure I remember it was Tracking 5 that gave me the bandit info, and some even lower skill level for war party.
I just put this here because sometimes I've wondered what exactly Tracking does and have found very little information about it.
I should add that I, as the party leader, don't have any points in Tracking, so these are the actual numbers.