Forget the taco trucks and roach coaches — there's a whole new kind of catering truck in town. Or perhaps we should say, "cakering" truck! That's right: Think cupcake craze plus chow wagon plus Twitter, and you've got the Bay Area's first mobile cupcake shop, Cupkates, a super-cute truck that appears (and disappears — don't miss it!) in various spots around Oakland, Berkeley, and Emeryville. Cupkates is the homegrown effort of Kate (natch) and her hubby, who supply long lines of salivating lunch-breakers with high-end cupcakes in gourmet flavors like Caramel Salt, S'mores, Double Chocolate, Strawberry Swirl, and, of course, Red Velvet. If you notice a crowd lined up where you've never seen one before, you may have stumbled upon the truck by chance — otherwise, to find out where they'll be, and when, follow them on Facebook or Twitter. But to ensure you score your favorite flavors, show up early; these babies are selling like hotcakes — er, like cupcakes.