Thank you very much for your help. Yes, I am trying the dreaded 3 across with a newborn, DS (5 1/2 yrs old, 48 inches, 56 pounds and just at the top slot of his SK Radian) and DD (8 yrs old, 4'8", 65 pounds but needs to stay in a HBB b/c the headrests in our Camry are awful and don't hit her at a good spot when she's in a backless, plus I like the extra safety of a hbb). Given my DS stats, how long do you think he'd last in a Defender or SureRide??
I currently have a SK Radian and GN. I've purchased a Parkway (with the wider sides), MR 70, Size4me and TB to try (and plan to return the ones that don't work). The best I could come up with is putting the Radian RF in the middle with TB on each side. This was just a rough estimate as it is about 20 degrees here and I couldn't take much more so the Radian was just sitting in the seat (not belted/LATCHED) and I didn't see if it would push my husband's seat up too far. (I tend to have fast growing babies plus I have back problems so I'm fine not having a removable infant seat to hoist around). My DD is also just at the point of being too tall for the TB.
So my next steps... If you think my DS could last for a while in the Defender or SureRide I can try those. Then for my DD I was thinking of trying the narrower (w/o the wide side wings) Parkway, Recaro Vivo, Safety First Air Boost, the First Years Compass, Cosco Pronto and harmony v6 (since the Monterey requires head support from the car I don't think that will work with the funky Camry headrests as it pushes too far forward). Seriously, will Target cut me off from returns! Thanks again for your help!