I never thought about going to an actual store and trying!
How old of a child would you carpool? If he or she is 3 then I would not put them in a booster seat. The minimum age for a booster is 5 to 6 years old. A child too small can be hurt by the booster seat. Also its easier to have 3 seats with 5pt harness across then to have 2 5pt seats and one booster. The reason is it can be hard to put your hand in between the seats to buckle the booster in. You can go to a store like babies r us to try seats out. Dawn