I've you've played the DLC, you've probably noticed the few Dawnguard members who wander around and do nothing. I really wish they were used a bit more, maybe they could handle sidequests. I know that most of the Dawnguard members can follow you, but I want them to do something else. For example, Mogrul the Orc. He doesn't do anything at all. Would it be too hard for him to say, "I heard about a group of vampires holed up in a cave. Want to tag along?" And then he would follow you, help you kill the vamps and return to Fort Dawnguard. Just a thought.

You could make them do it. Get the radiant quest from the Troll Taming smith and then take one of them along with you. Beth doesn't have to do everything for you lol