Recently I was looking over pictures where the An-225 is parked (because that's a normal thing for a normal person to spend their time doing). I noticed that the chocks are almost always placed around the third wheel from the front in the undercarriage: (Thanks to ratchet freak for the better picture).
Presumably that's because the centre of mass (COM) is closest to that wheel? But why would the undercarriage not be centered around the COM?
Bonus question: Very occasionally, I've seen the chocks placed around the entire undercarriage, in front of the first wheel and behind the last wheel. Why the occasional difference?