It would be easier to answer this question if you share why you had the c section in the first place. Depending upon the reason for the first, you may not even be given the option to have a vaginal delivery so this may all be moot.
However, most doctors assume they will perform a section delivery in subsequent pregnancies after you have already had one. It's actually approached by ob/gyn's as giving you the choice of having a natural birth if you want to try, and if it's medically possible after your section. Some women depending on the type of section and healing afterward have difficulty with natural deliveries after, so it is not a subject they push.
However, I don't want to tell you to lie to a doctor, but I would never give them the reason for desiring a section as convenience. They would have a hard time floating that one by your insurance company. Sections do cost alot more than natural deliveries. I would maybe use fear or discomfort as an excuse! I had 2 natural deliveries and the 3rd ended in a section. No one believed me when I said the pain was too much (as my epidurals don't work!) the doctor said it is supposed to hurt. I said I had two deliveries and I know what childbirth pain feels like, but this was different and I thought I would die. When I refused to push and was crying and screaming, he took me for the section. My 9lb daughter (my boys at only 7 lbs both had me pushing for 6 hours each) had decided to bring my bladder with her if I had delivered her naturally, and hard started to split my pelvic bone. My doctor promised to pay more attention to mothers in the future during delivery. I will never have a natural delivery again. If a doctor even mentioned it, I would tell them that if they would not do a section before putting me through 24 hours labor, I would find another doctor. I believe three miserable births are enought thank you! I agree...Section is the only way to go.
"ow that needle hurt...Oh a baby!!"
hee hee