While not the finest cavalry in Ozz, Munchkin heavy cavalry are competent. Due to the size and stature of their ponies, only the smallest Munchkins can join the cavalry. This reduces their shock effect on the battlefield.
I just completed a unit of Munchkin heavy cavalry, completing my Munchkin cavalry brigade.
These fellows are eagerly awaiting the day when their players are released from house arrest due to the plague panic, and they can take to the field.