We drive a VW Van (yup, looked at everything else and no people carrier could cope with four carseats and a twin buggy), and love it. Lots of space. B**ch to park, though.
The boys were almost 4 when the girls arrived, so they didn't need a buggy anymore. And, as lots of people thought it would be really funny to point out, we already had all the stuff (including pram) that you need for twins. Yeah, that made it lost easier...
How do we cope? I'm at work four days a week, the girls in nursery and the boys in school. Don't think I could do it full time at home with the lot, though.
They are lovely (they are all healthy, none were premature, and they are all doing well, so we are very lucky), and it is really interesting to watch them grow and develop, to see differences and similarities, especially since we have both non-identical and identical ones. I occasionally call this my own twin study lab.
On other days, I just sit there, look at them, and think 'why'?!