My youngest, at 4 months about 18#/26", is quickly outgrowing his Snugride (older version 20#/26"). Which is a bummer b/c both the older kids used it for the first year. We have two forward-facing Radians with the Snugride in between in the backseat of my Tacoma Prerunner. I'm not real interested in buying a Snugride32. I heard it might be a better fit to not get a third Radian and a Marathon might fit better in between. Is this also true for the Safe Voyage. Aren't they made similar? The height of the Radians in inconvenient rear facing, but I loved the V-tether and we made it work. I love the Radians, but never had anything else. I want high weight/height limits and it must fit FF and RF. Any suggestions?