We are replacing seats after minor crash. She was in a Roundabout, but just to the top slot, so we looked at FF harnessed boosters. The Frontier sticks off the seat so much that no one can get by, Nautilus crotch strap is too close to the back of the seat and she's sitting on it, and Maestro doesn't fit the contour of the seats. The seat will have to fit 3-across (w/7-yr old in HB TB, 10-yr old in backless booster) in a 4Runner and a Taurus, and gets moved back and forth (Dad doesn't install well), so Radian is not a good option. Looking for great ideas from people who know more than me. Thanks so much.
I would be keeping her harnessed. She's just so tiny and she's only 5 yrs old.
She doesn't need to additional height of the Frontier, so since it sticks out so far, I wouldn't feel sorry about nixing it from your list.
But I'm pretty sure that either the new Evenflo Secure Kid 300 or 400, Evenflo Maestro, or Graco Nautilus can work. You just need someone to help answer your questions about them.
First, it used to be that it mattered to Graco if you were sitting on the crotch strap at all, but then they changed their minds a bit. I'd search for posts on that here, or start a new post about it. I also think at her petite weight that the crotch strap isn't likely to be adjusted right, so it's worth looking at it again.
As for the Maestro and the seat contours, as long as it fits tightly enough not to move more than one inch side to side, it's fine. The back of the seat doesn't have to sit flush against the car's seat back. Is that how it seems wrong to you? Or is it something else? I'm sure we can help you.
I also think that the Recaro Prosport is worth looking at for her.
I'd put one seat in one car and one in the other.
hths
henrietta