Lets talk about car seats! We bought a Radian RXT for our 4 year old a few months back based on online reviews describing it as one of the narrowest seats on the market. It fits quite well even on the NextGen rear seats which have thick bolsters. We just had our second child two months ago and have been using our old Graco infant travel system in the middle seat and it's been fine, but eventually our son will outgrow it so I went ahead an ordered a second Radian RXT. Verdict: It fits. Definitely can fit 3 of these car seats across. However, at least in the NextGen rear seats, because the outer bolsters are so prominent, it sort of prevents the car seat bases from being placed outwardly enough to keep all the seats vertical. In other words, the two outer seats would be fanned out a little at the top, i.e. tilted a few degrees outwardly. I'm not sure if the outer bolsters are the same on the textile or standard leather seats. Anyone know of any even narrower car seats that can definitely fit 3 across without issue?