Michael, back to your question of the BOOB express, I've witnessed some great high milage exchanges in recent days. Consider these examples.....
I sent Diesel Dog Catcher a rear axle (heavy sombit!) Went from PA to MI in I think 3 hops. A C6 went along with that one to another recipient, but I'm not sure how many hops additional.
Doug Benson got a generator or something from Ohio. I think that was 3 hops.
PAFixIt got a car from South Carolina to PA (MD-PA line really). 1 hop I believe.
I got an exchange axle back from MI. 1 or 2 hops I forget.
There's been many more I wasn't a party to. It's not fast, but it is free and efficient!