I'm not sure what part of town you're in, but Gregorys Towing Services
is about the only decent wrecker I've met, We snapped a ball joint shortly after doing the costco run, tripleA said it'll be 2 hours til we get there. Wife 7 months pregnant and several 100$ of food in car, in september? This guy showed up in about 15 minutes, took us out to the farm, spent and extra 25 minutes fiddling around to get the car next to a fence under a tree and helped me drop it onto blocks off the flatbed. Oh, and he only charged me $100~ for the 20 mile tow.
edit: The vehicle in question was a Lincoln Mark VIII, just under 18' overall, I think your bus would fit on his flatbed, or certainly his bigger wreckers.