I actually want to add a bit to this post. I had family come over for thanksgiving and we used the MDX at capacity for the first time. We have two girls in Convertible seats, and I was trying to put them on the driver's side door and middle seat, to allow for access to the third row by sliding the rear passenger side seat forward.....well, there is a problem, actually quite a few.
- When you install a seat using the latch system behind the driver you cannot (easily) access the latch system anchors to install a seat in the middle position, and viceversa.
- If you decide to use seat belts, the installation becomes a bit more difficult.
- Let's say that you made it work, the seat in the middle position will block the outboard sliding seat from moving, thus preventing access to the third row.
- If you can somehow make it move, you will have a hard time making it go back.
- The two seats arrangement actually works using the middle and passenger's side outboard positions...using this layout will also prevent access to the third row.
- We (7 yo niece and me) had to access the third row through the trunk, and you can imagine the difficulties about doing it that way.
In the end, we moved one of the convertible seats to the trunk, together with the booster seat my niece was using. There was still the challenge of buckling her (my 3yo) in, but it wasn't as bad as trying to get in through the trunk.
AND I have to also say that the installation of the convertible seat in the third row required me to remove the headrest, so it would not get in the way of the seat.
I have Britax seats, which run a bit large, but they are not the humungus ones they are selling today.
I would strongly recommend the Sunshine kids seats, which are designed "thin" so you can do three across with no problems, OR to skip the convertible seat all together and move to a 5 point harness booster, your kid will need to meet some weight and heigh requirements for that one though.