Believe it r not there were a few 300's out there with the gear slightly forward of the rest and they were tippy enough that you didn't dare walk to the back of an empty one. I seem to recall the first six 300's had to be equipped with pole stands as a result and I think the retirement of the VP of Engineering was hastened a bit when it was discovered.
I have long since left DH engineering but I don't imagine they would ever allow such a situation to be repeated on the -400's