I'm not going to Dragon*Con nor do I live in Ann Arbor/Detroit anymore, nor can I drive long distances (oops), BUT it just occurred to me, have you tried posting in the comms for ann_arbor_ypsi, umstudents, or on zimride or craigslist or something? You might end up with a stranger, but maybe you could find someone to help drive anyway. Anyway, I wish you luck finding someone! It's tough, I have tried to find ppl to drive me from Indiana to Michigan and never had luck myself.