Do you think a forward facing britax marathon and 1 forward facing radian and 1 rear facing radian would fit in the back of a 2006 honda civic or a ford explorer?
The 2006 isn't quite as bad as my 2005 for car seat fit. I'm sure I couldn't do it in my 2005. I might be able to do it with a Roundabout instead of a Marathon. I've done a FF Radian and a RF Radian and a RF Roundabout in my Civic before. It's very difficult but it's possible.
You might need help from a tech to make it work, if it's possible at all. You may need to pull off several "advanced installation techniques."