I have 2 Diono Rainier's in the wide bench side. Outter one facing forward and middle facing rear. I believe that the Rainiers are a bit wider than the Radian RXT's. They fit fine and allow the shorter side to move forward. I don't think you'll have a problem with 2 rear facing unless the Driver is tall and needs to recline the seatback. The Diono's have high backs so you may need the foam angle adjuster.

 

Following. I'm about to order a 2nd carseat (possibly the Graco Slim Fit) to be installed rear facing. This will be the 2nd rear facing on the wide side of the bench and we also hope to still have easy access to 3rd row.

 

Check out the car seat lady's website. She has reviews on narrow car seats, reviews on particular vehicles, etc. that can help you buy confidently.

For our 2nd gen I believe we will invest in the Clek Floonf if for nothing else I like saying the name and it costs the same as the Radian RXT (so expensive but nothing else is this narrow). We currently have on forward facing, one rear facing and are hoping to add a third to the mix. By that time we will have 1 booster, 1 forward facing (probably in the Britax Marathon we have now) and one rear facing in the new seat.

 

I previously had 2 Diono Radian RXT on the wider 60% side and I was able to slide the 40% forward to gain access to 3rd row. I did have to PUSH the middle car seat over a because the seat belt buckle slightly hits it. I have forward facing on the driver side with rear facing in the middle.

Because i have 2 cars (4 car seats). I recently swapped car seats. Put a safety 1st 60 car seat for my older forward facing with Diono radian rear facing on the 2nd row. It can still slide the 40%, but I really have To PUSH the car seats over to get the seat to slide past the buckle... it's a slight nuisance but it works.

 

I have the radian both forward facing and I will say it's a bit tight. With rear facing it should be a bit better but I would definitely use the foam pad underneath.

 

thanks you so much