On the trip up, there were two cars, and we had an iVAN – that is, an intra-Vehicular Area Network. In one car, we had an inverter, and a wireless access point. I was in the other car, running the IRC server. I also was streaming Old Time Radio podcasts from iTunes, which they were playing on the stereo in the other car.
Oh, yeah, and we had CB radios, too.
We got a pretty strong link between the cars when we were 2 or 3 car lengths away, but beyond that, it broke down pretty fast.
Mostly, though, it was cool just to do it. And very geeky. 🙂