I thought of this back in High school, 4 way crosses were the rage at the time in the beef industary. Hybrids as they were called. I want to create a 3 way cross of the QH, ASB and ASH or mustang, the goal was to make a smooth riding cow horse with the endurance.
As far as I got with the idea was playing with it on paper, trying to firgure out how to get a 33%, 33%, and 33% mix of all breeds. I am sure now it wouldn't have worked on several reasons but it seems like a good one at the time.
I even had a name for the breed: Kentucky Cow Horse