Sorry, I mean, why do you want an X5/X3? If it's just for carrying surely wouldn't something like an estate/mpv offer the same capability?
Personally I don't see the point of either the X5/X3. They don't appear to be able to offroad and they don't seem to offer anything an estate doesn't.
Our Christopher wants to waft arooond for a few months - leave him be...let him waft