I know USPSPRO is. I do 3-5 a year and have Knoxville Double Century (It's the staff ride) coming up this weekend and Death Valley Fall Double next month. The regular ride is the week after the staff ride, which I'll be driving my mini-van as a SAG vehicle. Anyway, I digress..
We haven't ridden the tandem on a double yet but I would love to. I'm not sure she's got it in her. We will be doing our first single later this month on the Riverbank Century (her idea).
So, any of you crazies here do doubles?