Help me choose new seats please!


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We drive both an ‘06 Dodge Grand Caravan and a ‘04 GMC Sierra crew cab. Currently in the van but will be switching back to the truck soon.
I have a 4.5 yo (40 lbs) FF in a diono radian rxt, 3 yo (26 lbs) RF in a diono radian rxt, and a 13 mo (22 lbs) RF in a Graco Snugride 30. I’m unsure on heights but will check ASAP.
I need to get my youngest into a new seat in the next few weeks since he’s about 1.5” from the top of the shell in his infant seat. Should I be getting him a new seat or switch my oldest to a harnessed booster and put him in her radian (RF of course)? I want to keep my oldest harnessed as long as possible so have looked at the Britax frontier but have heard it doesn’t fit well in the Grand Caravan and haven’t found much info on fit in the Sierra.
Which seats would you recommend? We’ll mostly be using the GMC Sierra except for long trips.
Also, I’m in Canada. Cannot try seats in my vehicles as we live in a super small town and don’t have access to any stores that will allow us to try seats

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