Either of Gary or Mark want to drive my pickup? I'm thinking hard about this but there's no way I'll be able to ride the whole thing.
I've never met you or know your current endurance level, but with just a little bit of training between now and then, you can do this no problem. Even if you put in 30-40 miles a week (that's 5 mile rides, then a longer ride on Sat), you can condition yourself good enough to do the whole thing. Especially if you have people riding with you, it seems to make the miles go by way faster.