I did it in an '02 Chevy Malibu, which affectionately refer to as the "5lb bag"...as in "10lbs of poo in a 5lb bag!" We have a FF Radian, RF Marathon and a Parkway. I just bought another Radian for when we go FF with my littlest. The trunk has plenty of room for my Sit-n-stand stroller, when I decide to drag it out, and we've done Bj's runs in it. It's a tight fit, but we're all in there!
Only problem I have found with 3 across...the kids can get to each other too easily! They agitate the sweet bejeezus out of each other! And they drive me nuts in the progress!
Chris.
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DS 10/03
DD 6/05
DD 11/07