We always did the caravan thing...i.e. if we ever went anywhere all together (like for church) we took two vehicles and Mom drove one and Dad the other. Usually there was some argument about who got to go in whatever car was considered best - or with the parent that was most likely to stop for treats. Heh...
Heh, after we started driving we downgraded to an 8-seat SUV. Mom and Dad would go by themselves and make me drive the kids.
The pastor noticed this and, ah, commended them on their decision ;-) Needless to say he has six kids and knows that big-family parents need even a car trip on their own sometimes...