How does trample work with hide and hide in plain sight?

Let’s say there is a treant shadowdancer who does not appreciate interlopers in its forest. Assuming it has enough hide skill to remain unseen, and as silly as it sounds, can this treant trample over everyone until they’re all dead while remaining unseen? Alternately, if the act of trampling negates the hide, can it use the shadowdancer’s hide in plain sight ability to simply hide again at the end of its movement since the hide skill states that hiding happens as part of movement?