A.E.
I have both seats. The nautilus fit like a dream in my husband's quad cab toyota tundra. When he traded it in for an Altima with leather seats we could not get it in securely enough. So now, the nautilus is in my grand caravan and the frontier is in the altima. The frontier is a TANK! It is TRICKY to install, even in the minivan. You have to read the directions over a few times. I have had a Britax Marathon and Boulevard, which are easy to install compared to the frontier. I used to wish that I had just gotten two nautilus seats but now am glad that I had another option for the altima. A good thing about the frontier is that it doesnt expire for 10 years! So if you want a seat for your other kids, it is worth the money.