The chocolate color comes from the silver dapple gene based off black. I believe that red chocolate comes from the silver dapple gene off of bay. Color gurus can help me out with the red if I am incorrect.
You do not want to breed a silver dapple carrier to a silver dapple. This can result in an eye defect known as ASD. Simply google it and you will get more info from those that have studied it.
The Rocky/Kentucky Mountain Horse had to carry the owner to work, haul the cart in the mines, ride the kids around and pull the buggy on Sunday so they were bred for a willing attitude and gentle temperament. Tobe is the foundation stallion for the Rocky's along with several others. They are a relatively rare breed yet and some of the very well trained command a high price.