Re: 2nd VBAC with twins?
I haven't. But...just before my vbac with dd2, I found out she was breech. There was an ob near me who did lots of vaginal breech deliveries, and when I called him up to talk about a breech vbac, he told me that the day before he had done a vbac for twins where both babies were breech! I don't see why you couldn't vbac twins. Most providers would want baby a to be head down though, but obviously there are providers out there who are comfortable delivering the other variations with twins also. Good luck.
Kirra, mom to my three crazy girls, Maebelle (12/22/07) and Adelaide (2/26/10-my HBAC baby!) and Etta (8/7/13) and expecting little squish #4 (sometime in 4/16)