Bounty Hunters have another skill which Marks their target. If you use the Collect Bounty skill on a marked target, it will double the damage of their attack. A Bounty Hunter with a high crit rate and good accuracy can absolutely destroy their targets. My highest crit so far is 53 damage which straight up killed a Rank 3 dungeon Large enemy that had 48 HP
Bounty Hunters are basically the best class in the game in my opinion. They can deal double damage, knock back or pull enemies out of place (two different skills), hit any enemy from any spot and if that enemy is stunned it will deal 40% more damage...they're just fantastic. They're definitely a bright spot on any team.
Best skills that I use: Collect Bounty (double damage on Marked), the Marking ability, and either the knock back or pull forward skill (I like pull forward better), if you have another stunner use Finish Him (ranged to any spot) for that extra damage on the stunned, of if you don't have a stunner use Flashbang for stuns.
I have yet to get a Bounty Hunter from the Caravan.