We had an 08 with the 3rd row seat. We now have a 2011 with the 3rd row seat. NEVER used the 3rd row seat. You can fit three seats in the center row--albeit tightly...Here are some pictures of my 011 with three seats in the back:
http://www.xoutpost.com/bmw-sav-foru...econd-row.html
CONGRATS ON THE TRIPLETS!!
FYI: I have a 1, 2 & 4 year old. All were in diapers simultaneously. You will average (over) 500 diapers, per-month, for at least 2.5 years. COSTCO...