[Tuidjy]

Defense helps, and so does body ethereal. Size difference matters a lot.
It lets the trampler attack a lot more units, and it increases damage.
Luck, mistform, and twist fate work (they usually do)

Repel does not seem to work. Armour matters only when the sizes are very close,
because trample damage gets very high. The defender's AP do not matter.

If you are trying to trample a Virtue, it will be hard. She is likely to gather
afflictions but I've had great results with a Virtue with rings of ice and regen.