[Papooses]

The Fisher Price seats are made by Britax & based on the Britax seats, which are actually quite wide -- their shape can puzzle well in certain 3 across situations, though....

What is each child's actual age, weight, height? Including the carpool kids (as accurately as possible)

I'm guessing the Radian for your 4 year old & the Parkway for the 6 year old may be a solution. Or there's the Ride Safer Travel Vest for your 4 year old to use in a center seat position.

	Britax - Click for more info Britax International has been producing reliable child safety products for over 30 years. Not only does Britax have decades of experience creating car seats and other children's safety equipment, Britax has a long standing reputation as an industry leader and innovator. Britax International is headquartered in the United Kingdom, but Britax car seats are designed and manufactured at facilities in Germany, Austria, and the United States. In the summer of 2002, Britax strengthened their commitment to creating the safest car seats with the opening of a brand new, state-of-the-art crash testing facility in North Carolina. Britax car seats have a reputation around the world for being some of the safest, most reliable, and best designed child safety seats ever made.

	Britax Parkway - Click for more info The new Parkway Booster from Britax builds on their company's reputation as the maker of some of the safest seats on the market today. It's one of the only boosters to offer True Side Impact Protection - the EPS foam-padded headrest and side "wings" aren't just great for naps, they're engineered to provide vital protection to your child in the event of a side-impact crash. (Side-impact crashes are the leading cause of death for children ages 6-14, making this an issue of major importance for booster seats.)

	Sunshine Kids Radian 80 or 65 - Click for more info If "the Sunshine Kid's Radian 80 convertible car seat is (probably) the only car seat you will ever need," the "probably" part of this statement comes into play when you directly compare the Radian 80 with the Britax Regent. While the Radian 80 has a very high weight capacity, the seat width is only 10" vs. the Regent's 14" seat. The Britax Regent may be a bit wider, but it is very bulky, is only forward facing, and does not fold like the Radian 80. Because the Radian 80 is so narrow, you can potentially put three of them side by side in the back seat. Three Regents side by side? Impossible.