I checked the three across thread with no luck. My sister is thinking about getting a 2010 Nissan Versa. She has two kids and one on the way. When the baby is born she will have 6 year old, 3.5 year old, and nb. The 5.5 year old mostly uses the Regent right now but does great in a booster already. She is 48 pounds and 44 inches now. The almost 3 year old is rf in her Marathon right now but is pretty small, not much bigger than my 2 year old, about 30 pounds and 35-36 inches. She is happy with rfing or ffing her at that point. The seats she has right now are Regent, Marathon, SS1, and a Turbo. Would it be possible to do three across with the infant seat and any two of the others? Or will she need a Radian in the mix? She is open to selling some of the ones she has or just installing them in her dh's truck. You could fit three Regents across that thing!! Any opinions other than going and trying them out?!!