I SAGd a few times during CAR 7, most notably the day I got dehydrated and spent the night in the med tent with an IV. D'oh. They made me sit out the day after as well (blah), but it worked because I also had lost a contact lens, and got to go track down another pair from the local lensaria.

It sucked, I hated it, but the high at the end of the ride was still great.

Nope, wouldn't go into a ride planning to SAG. May as well drive, right? It's good to know the contingency's there, but it wouldn't be my game plan.