[Garfield]

It's not unusual at all for there to be two car seats in mine. They love to ride in it, especially with the exhaust now...
Getting two "baby seats" (not booster) in the back is a little tricky since they both touch. I travel with a 2.5 and 4 yr old back there a lot.
I'll post a pick next time I put them in.

 

[Garfield]

Here's some pics. While we're at it, I also put a two child bicycle stroller in the back. All three wheels are removable, and although it blocks the rear window a good bit, it's great to have for storage on your "walk", shade, and a place for them to sit, not to mention the obvious transportation use.
Also, I'm about 5'10", 160lbs, and I STAND crouched over in the rear footwell while I buckle them in. Makes it almost as easy as a Van. I can't even do that in my Audi allroad.