I know I am a little late with my advice, but I wanted to share my 2-cents since I can understand from experience your needs. We have 3 children- ages 3, 2 & 1- and number 4 on the way. I currently drive a Ford Explorer, and it does fit 3 regular size car seats in many different configurations.
Typically, I put my oldest 2 in the 3rd row, and the 1 year old in the middle row- against the door (if your not comfortable with your child by the door the seat can go in the middle, and the two door seats fold down for access to 3rd row). This allows me to fold the other two middle row seats flat for easier access to the third row- I can climb in and close the door if needed while buckling kids up. Even using the 3rd row, I still have room in the back for either groceries or a double stroller- I can't fit both in the back together, but the groceries can also fit in the middle row if you happen to have the stroller in the back (if I know I am going to the grocery store, I usually take the stroller out to keep the back open for food).
If we are traveling and need more storage space, we can fit all three seats in the middle row, then the 3rd row folds flat for ample storage space. Depending on the type of carseat, you might need to adjust the tilt on one or two of the carseats to get them to fit, but they can fit.
From experience, I know the Explorer works. I have seen commercials for the new Honda Pilot, it says it is an 8 seater, so that might be worth a look too.
Hope some of this info helps