Triad- here is some information on seats I have been looking at for my tall toddlers- but the info may help you- I drive a 2000 Odyssey. *We did figure out we had to remove the handles off the backs of the FRONT seats to get the larger car seats to fit RF if you have the front seats extended all the way- it's a tight little puzzle in an Odyssey, and if you haven't bought it yet, I would seriously steer you toward the Toyota Sienna! Anyway, I digress...
The Britax Marathon
Rear-Facing: 5 – 40 lbs, a standing height of 49 inches or less
and seated shoulder height of 9 – 16.75 inches.
Forward-Facing: 1 year & 20, up to 70 lbs, a standing height of
49 inches or less
and a seat shoulder height of 12 – 16.75 inches.
The Britax Boulevard
Rear Facing: 5 - 40lbs, 9 - 16.75 inches seated height
Forward Facing: 1 year and 20lbs, up to 70lbs, 12 - 16.75 inches
seated height 49 inches overall
The Britax Frontier
Forward Facing and Booster Only AGE 2 AND UP
Highest 5 point harness seat capacity allows your child to remain
harnessed up to 85 pounds or in booster mode to 120 pounds.
Forward Facing: 2 years & 25lbs, up to 85lbs 30" - 57" overall
Seat harness height 12" - 20"
Booster 40lbs - 120lbs 42" - 65"
13.5Lbs - 24.5Lbs
The Radian Diono R100
Rear-facing: 5 - 40 lbs
Forward-facing: 20 - 65 lbs (and up to 57") in a 5-point harness
Booster to 100 lbs
The Radian RX
5-45 lbs. rear-facing with at least 1.5” of carseat above the child’s head or total height of 44”
20-80 lbs. forward-facing with a child less than 57” tall
50-120 lbs. as a booster with a child less than 57” tall, but child’s shoulders must also be at or above the 4th set of harness slots
5 harness slot positions on carseat: 9”, 10.5”, 12”, 15”, 17.5”
3 buckle slots: 3.5”, 5.5”, 7”
First Years True Fit
RF to 35, FF to 65 Up to 50"
Can't find seat harness height :/