Thanks for the advice. It sounds like what I'm hearing is that it might be do-able, but it'll be pretty snug (at least for as long as a rear-facing seat, and/or a stroller is required). That's a good point about the suspension, I hadn't thought of that.
I'd rather avoid going for something as big as a Q5 or X3, though, if I can... & I take some comfort from the fact that Lucky13 and 36Joules are managing to make it work...
So here's a question -- would you be able to pack for a week-long trip with the baby (with stroller, a couple of suitcases etc) in the X1 or would that *really* be tight? I guess I don't really know how much space strollers take up!