Is the vertical part of the T on your skin or your uterus? If the incision on your uterus was horizontal, then I think you're biggest challenge will be because you had 2 c-sections. Lots of women have VBA2C's but it is harder to find a willing care provider. If the first incision on your uterus was vertical, your risks of rupture do go up because that scar goes with the muscle fibers and is not as strong as one that goes across the fibers. Again I know that people have successfully VBAC'd after this type of incision, but you'll want to read up on the rupture rates, and try to determine if they are quoting partial ruptures or complete ruptures. (Sorry, it's been so long since I researched rupture rates I don't have any good links. If you don't find what you need here, the ladies at the parentsplace VBAC board are great, too.)
Good luck on your journey. Isn't it the pits how a scar has so much affect on things?