Ok, turns out that my scale *lies* and they weight about 10 lbs less than i originally said. We were at the doc's for stitches removal (coffee tables can be dangerous!) and I asked for all the girls to weigh in. So they weight about 47, 41 and 31. So the panic has subsided somewhat but I am still looking for a good solution. Oh and turns out that Radian's RF limit is 40 lbs not 45 like I thought.
Info I missed before: The back seat has three complete seats: seatbelt (not just a lap belt, a full over the shoulder belt), LATCH and a space to tether on the rear dash. Used the LATCH for the Radians and the tether for the FFing ones. Couldn't figure out where to tether the RF one. There are no headrests, just bumps in the seat where the headrest would be.
The Radians themselves are a tight fit and I have to load them in a particular way or I can't tighten the belts properly but they are in tight. Had a seat check, tech didn't see any problems. I don't have a budget, especially now that I'm no longer in a rush and can save up for seats. Getting 3 Radians was expensive but it was the best option for us at the time. We had two Britax seats before these and there is no way you can do 3 across with them - they are monsters! I think 3 new seats are cheaper than a new car. Granted I haven't looked in 3 years... :D
At this rate the 2.5 year old will reach 3 RFing and I'm ok with that. I don't think my priority is keeping her RFing past 40 lbs. I would love to keep all three in the back seat so that we can all go somewhere together as a family in one car! It seems it is a race between whether DD3 will reach 40lbs or DD1 will grow out of her Radian sooner because in either of those cases I need to do something different than what we have at the moment.
We tried two Radians side by side and they are just too big on top to fit into the place properly. Their bases are ok but the rest of the seat isn't. So while we had two RF kids, DD1 had to climb in over other seats and then I could just buckle her reaching over someone.
So there's my essay! Tell me ladies, what are my options? I suppose simplest (cheapest too) thing is to move DD1 into the front seat and leave the other two in the back seat, FF or RF. I would really like to avoid that though just for practical reasons. Just until we figure out finances enough to get a suburban camo vehicle (that is, a van).
TIA
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