Just a quick thought on time line, as it's commonly misunderstood, when they put a 'time limit' on spacing of CS, it's not between previous birth to current pregnancy, it's birth to birth, and that rec. is between 18 months. So if you had a CS, and got pregnant 9 months after, assuming you go the typical 9 mo pregnancy then you are in the clear. If you don't have a typical 9 mo pregnancy, then you are probably birthing in a hospital anyway, and one with a high level NICU and Obstetric floor. So rupture is not near as scary.
There really isn't much difference in the date of 18 mon limit and 12 mon limit, that's why most areas stick with the 12 month limit between CS if they are really really going to stick with one. Everyone else, I feel, should give a little, and let the mom make her own decision.