I keep seeing people spamming /1 and /2, sometimes for an hour, desperately looking for a tank for RFC or WC or something. You don't need a tank for these dungeons, any class can "tank" as you're mostly just stomping weak elites. A "prot" warrior with a shield and 4 points into the protection tree isn't a tank, he's a bad DPS.
You don't need to search around for a tank for two hours for your Wailing Cavern run. The level 19 Rogue can do it just fine. You won't need a real tank until the 30-40 bracket or so, and even then an Arms-specced Warrior who knows what he's doing is arguably better than Prot with sword+board.
This has been a public service announcement.